Document And Entity Information
us-gaap_DefinedBenefitPlanPlanAmendments
Plan change
Note To Financial Statement Details Textual
statementsignificantaccountingpoliciespolicies
Foreign currency exchange adjustment
statementnote1summaryofsignificantaccountingpoliciestables
Property, Plant and Equipment [Table Text Block]
statementnote3goodwillandpurchasedintangibleassetstables
us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Income taxes payable
cohu_UnrecognizedTaxBenefitsInterestExpenseNetOfAccruedInterestReversed
Unrecognized Tax Benefits, Interest Expense, Net of Accrued Interest Reversed
Amount of interest expense net of accrued interest reversed for an underpayment of income taxes.
statementnote4discontinuedoperationstables
Actuarial loss
Actuarial (gain) loss
us-gaap_AvailableForSaleSecurities
Short-term investments
statementnote5financialinstrumentsmeasuredatfairvaluetables
statementnote6employeebenefitplanstables
Segment Reporting Disclosure [Text Block]
statementnote7incometaxestables
statementnote8segmentandgeographicinformationtables
statementnote9commitmentsandcontingenciestables
statementnote10guaranteestables
us-gaap_ValuationAllowancesAndReservesBalance
Balance
Balance
statementnote11accumulatedothercomprehensiveincomelosstables
Change in unrealized gain/loss on investments, tax
us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
Decrease in Unrecognized Tax Benefits is Reasonably Possible
statementnote14quarterlyfinancialdataunauditedtables
us-gaap_IncreaseDecreaseInDeferredRevenue
Deferred profit
statementscheduleiivaluationandqualifyingaccountstables
statementnote1summaryofsignificantaccountingpoliciescomputationofbasicanddilutedincomelosspersharedetails
Deductions/Write-offs
statementnote1summaryofsignificantaccountingpoliciespropertyplantandequipmentdetails
us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense
statementnote3goodwillandpurchasedintangibleassetschangesincarryingvalueofgoodwilldetails
Goodwill and other intangible assets
statementnote3goodwillandpurchasedintangibleassetspurchasedintangibleassetssubjecttoamortizationdetails
statementnote4discontinuedoperationssummaryofoperatingresultsdetails
us-gaap_IncreaseDecreaseInAccruedLiabilities
Accrued compensation, warranty and other liabilities
statementnote5financialinstrumentsmeasuredatfairvalueshortterminvestmentsbysecuritytypedetails
statementnote5financialinstrumentsmeasuredatfairvalueeffectivematuritiesofshortterminvestmentsdetails
statementnote5financialinstrumentsmeasuredatfairvalueassetsmeasuredatfairvalueonrecurringbasisdetails
statementnote6employeebenefitplansnetperiodicbenefitcostofswissplandetails
us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Other accrued liabilities
Inventory capitalized as capital assets
Represents information about inventory capitalized as property, plant and equipment.
Inventory Valuation Reserve [Member]
statementnote6employeebenefitplansbenefitobligationfairvalueofplanassetsfundedstatusandliabilityofswissplandetails
statementnote6employeebenefitplansweightedaverageactuarialassumptionstodeterminebenefitobligationandnetperiodicbenefitcostdetails
Plan Asset Categories [Domain]
statementnote6employeestockbenefitplanspostretirementbenefitobligationtofundedstatusandliabilitydetails
statementnote6employeestockbenefitplansstockoptionactivityundersharebasedcompensationplansdetails
Swiss Plan [Member]
Information about the Swiss Plan.
statementnote6employeestockbenefitplansstockoptionsoutstandingandexercisabledetails
Defined Benefit Plan, Asset Categories [Axis]
us-gaap_ProductWarrantyAccrualPayments
Warranty payments
statementnote6employeestockbenefitplansrestrictedstockunitactivityundersharebasedcompensationplansdetails
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Finite-Lived Intangible Assets, Amortization Expense, after Year Five
us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Lessee Leasing Arrangements, Operating Leases, Term of Contract
statementnote6employeestockbenefitplansequitybasedperformancestockunitsdetails
us-gaap_LesseeLeasingArrangementsOperatingLeasesRenewalTerm
Lessee Leasing Arrangements, Operating Leases, Renewal Term
Warranty accruals
statementnote6employeestockbenefitplansperformancebasedstockunitactivityundersharebasedcompensationplansdetails
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Finite-Lived Intangible Assets, Amortization Expense, Year Four
statementnote6employeestockbenefitplansweightedaverageassumptionstovaluesharebasedawardsgranteddetails
Short-term investments
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Finite-Lived Intangible Assets, Amortization Expense, Year Five
statementnote6employeestockbenefitplansreportedsharebasedcompensationinconsolidatedfinancialstatementsdetails
us-gaap_PolicyTextBlockAbstract
Accounting Policies
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Finite-Lived Intangible Assets, Amortization Expense, Year Two
statementnote7incometaxescomponentsofprovisionbenefitforincometaxesforcontinuingoperationsdetails
Valuation Allowances and Reserves [Domain]
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Finite-Lived Intangible Assets, Amortization Expense, Year Three
statementnote7incometaxesincomelossbeforeincometaxesfromcontinuingoperationsdetails
statementnote7incometaxescomponentsofdeferredtaxassetsandliabilitiesdetails
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months
Fair Value, Measurement Inputs, Disclosure [Text Block]
statementnote7incometaxesreconciliationofincometaxcomputedatusfederalstatutorytaxratetoprovisionbenefitdetails
us-gaap_IncreaseDecreaseInAccountsPayable
Accounts payable
Valuation Allowances and Reserves Type [Axis]
statementnote7incometaxesreconciliationofgrossunrecognizedtaxbenefitsdetails
Semiconductor Equipment [Member]
Semiconductor equipment as a business segment.
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
statementnote8segmentandgeographicinformationcustomerscomprising10ofconsolidatedsalesdetails
statementnote8segmentandgeographicinformationsummaryofnetsalestocustomersattributedtocountriesdetails
Real Estate Investments [Member]
This element represents direct equity investments in real estate projects
statementnote8segmentandgeographicinformationsummaryofpropertyplantandequipmentandotherlonglivedassetsingeographicalareadetails
statementnote9commitmentsandcontingenciesfutureminimumleasepaymentsdetails
Alternative Investments [Member]
Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds.
statementnote10guaranteesandotherobligationschangesinaccruedwarrantydetails
statementnote11accumulatedothercomprehensiveincomelosscomponentsofothercomprehensiveincomelossdetails
us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent
Adjustments related to postretirement benefits, tax
statementnote11accumulatedothercomprehensiveincomelosscomponentsofaccumulatedothercomprehensiveincomenetoftaxdetails
Foreign currency translation adjustments, tax
statementnote14quarterlyfinancialdataunauditedsummaryofquarterlyfinancialdatadetails
Net sales percentage
statementscheduleiivaluationandqualifyingaccountsvaluationandqualifyingaccountsdetails
Remaining Useful Life (Year)
Notes To Financial Statements
Post-retirement Health benefits [Member]
The post-retirement health benefits.
Notes To Financial Statements [Abstract]
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive loss
Rasco Technology [Member]
Represents information about Rasco technology.
Sales Revenue, Net [Member]
Schedule of Product Warranty Liability [Table Text Block]
Ismeca Technology [Member]
Represents information about Ismeca technology.
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Common stock, shares outstanding (in shares)
Concentration Risk Benchmark [Domain]
Equity Based Performance Stock Units [Member]
Equity based performance stock units.
Employee Stock Purchase Plan [Member]
Employee stock purchase plan.
Concentration Risk Benchmark [Axis]
Cash and cash equivalents
Cash and cash equivalents at beginning of year
Cash and cash equivalents at end of year
cohu_PercentageOfFairValueToDeterminePriceOfCommonStock
Percentage of Fair Value to Determine Price of Common Stock
Percentage of the Fair Value to Determine the price of common stock.
cohu_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlansFutureIssuance
Stock Issued During Period Shares Employee Stock Purchase Plans Future Issuance
stock issued during period shares employee stock purchase plans future issuance.
us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Valuation Allowance
Less valuation allowance
us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Total share-based compensation, net of tax
us-gaap_DividendsCommonStockCash
Cash dividends - $0.24 per share
Share-based compensation of continuing operations
Summary of Valuation Allowance [Table Text Block]
us-gaap_DeferredTaxAssetsNet
Total deferred tax assets
us-gaap_IncreaseDecreaseInOtherOperatingAssets
Other current assets
us-gaap_DeferredIncomeTaxLiabilities
Total deferred tax liabilities
us-gaap_DeferredTaxAssetsGross
Gross deferred tax assets
Other
Customer Concentration Risk [Member]
Share-based compensation expense
Allowance for Doubtful Accounts [Member]
Deferred profit and gain on facility sale
us-gaap_SaleLeasebackTransactionAnnualRentalPayments
Sale Leaseback Transaction, Annual Rental Payments
cohu_StandardProductWarrantyTerm
Standard Product Warranty Term
Describes the term of the product warranty.
Concentration Risk Type [Axis]
Concentration Risk Type [Domain]
us-gaap_SaleLeasebackTransactionDeferredGainNet
Sale Leaseback Transaction, Deferred Gain, Net
us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
Sale Leaseback Transaction, Current Period Gain Recognized
Gain on sale of facility
us-gaap_SaleLeasebackTransactionDeferredGainGross
Sale Leaseback Transaction, Deferred Gain, Gross
Interest income
Sale Leaseback Transaction, Name [Domain]
Sale Leaseback Transaction, Description [Axis]
us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Repurchase and retirement of stock
Sale Leaseback Transaction Disclosure [Text Block]
Net sales
Net sales
Defined Benefit Retirement Plans [Member]
The defined benefit retirement plans.
us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts receivable
Accrued employee benefits
us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Stock-based compensation
us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
Stock Issued During Period, Shares, Employee Stock Purchase Plans
Shares issued under employee stock purchase plan
us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Exercised (in shares)
Tax credit carryforwards
Exercise of stock options
Fair Value Measurement, Policy [Policy Text Block]
Net operating loss carryforwards
Segment Reporting, Policy [Policy Text Block]
Shares issued for restricted stock units vested
Foreign Currency Transactions and Translations Policy [Policy Text Block]
us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Other assets
us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Defined Benefit Plan, Net Periodic Benefit Cost
Net periodic costs
Comprehensive Income, Policy [Policy Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Cancelled (in shares)
Earnings Per Share, Policy [Policy Text Block]
Performance Stock Units [Member]
The performance stock units.
us-gaap_IncreaseDecreaseInInventories
Inventories
Granted (in shares)
us-gaap_CashSurrenderValueOfLifeInsurance
Cash Surrender Value of Life Insurance
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
cohu_CumulativeThreeYearPreTaxIncomeLoss
Cumulative Three Year Pre-tax Income (Loss)
The amount of cumulative three year pre-tax income (loss).
Income Tax, Policy [Policy Text Block]
us-gaap_DeferredTaxLiabilitiesOther
Other
us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities
Discontinued Operations, Policy [Policy Text Block]
us-gaap_LiabilitiesAndStockholdersEquity
us-gaap_UndistributedEarningsOfForeignSubsidiaries
Undistributed Earnings of Foreign Subsidiaries
Retained earnings
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total accumulated other comprehensive loss
cohu_CollectionTermRange
Collection Term Range
The collection term range.
Inventory, receivable and warranty reserves
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory and warranty reserves.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]
cohu_DeferredTaxLiabilitiesAssetBasisDifferences
Acquisition basis differences
Amount of deferred tax liability attributable to taxable temporary differences from acquisition basis differences.
Acquisition basis differences
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from acquisition basis differences.
Settlements, adjustments and releases from statute expirations
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements adjustments and releases from statute expiration.
cohu_DefinedBenefitPlanNetPeriodicBenefitIncome
Defined Benefit Plan, Net Periodic Benefit Income
The total amount of net periodic benefit income for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.
Intel [Member]
Information about Intel.
Rest of the World [Member]
The rest of the world.
Malaysia [Member]
Information about Malaysia.
Depreciation and fixed asset related
Advertising Costs, Policy [Policy Text Block]
us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated net adjustments related to postretirement benefits
Accumulated net unrealized gain/loss on investments
us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Accumulated net currency translation adjustments
U.S. State
us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
U.S. State
Changes in current assets and liabilities, excluding effects from acquisitions and divestitures:
Foreign
us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Foreign
us-gaap_AssetsFairValueDisclosure
us-gaap_ForeignCurrencyTransactionGainLossRealized
Foreign Currency Transaction Gain (Loss), Realized
U.S. Federal
us-gaap_DeferredFederalIncomeTaxExpenseBenefit
U.S. Federal
Additions (Reductions) Not Charged to Expense
Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, not charged (credited) to costs and expenses.
us-gaap_CurrentIncomeTaxExpenseBenefit
Total current
SWITZERLAND
Statement of Comprehensive Income [Abstract]
Additions (Reductions) Charged (Credited) to Expense
Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges (credits) to costs and expenses.
us-gaap_IncomeTaxCreditsAndAdjustments
Income Tax Credits and Adjustments
CHINA
us-gaap_DeferredIncomeTaxExpenseBenefit
Total deferred
Deferred income taxes
cohu_PercentageOfRevenueRecognizedUponCustomerAcceptance
Percentage of Revenue Recognized upon Customer Acceptance
The percentage of revenue recognized upon customer acceptance.
GERMANY
us-gaap_CashAndCashEquivalentsFairValueDisclosure
Cash and cash equivalents
Comprehensive Income (Loss) Note [Text Block]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
us-gaap_ShareBasedCompensation
Share-based compensation expense
Other assets
us-gaap_ForeignEarningsRepatriated
Foreign Earnings Repatriated
Accrued retiree benefits
Revenue Recognition, Policy [Policy Text Block]
Common stock, $1 par value; 60,000 shares authorized, 26,842 shares issued and outstanding in 2016 and 26,240 shares in 2015
us-gaap_TableTextBlock
Notes Tables
Standard Product Warranty, Policy [Policy Text Block]
Commitments and Contingencies, Policy [Policy Text Block]
Common stock, shares issued (in shares)
Certificates of Deposit [Member]
Common stock, shares authorized (in shares)
Amendment Flag
us-gaap_DepreciationDepletionAndAmortization
Depreciation and amortization
US Government-sponsored Enterprises Debt Securities [Member]
us-gaap_Depreciation
Depreciation
Common stock, par value (in dollars per share)
us-gaap_AssetsCurrent
Total current assets
Goodwill and Intangible Assets, Policy [Policy Text Block]
us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Loss on disposal and impairment of fixed assets
Foreign Tax Authority [Member]
State and Local Jurisdiction [Member]
Preferred stock, $1 par value; 1,000 shares authorized, none issued
Income Tax Authority [Domain]
Current Fiscal Year End Date
Domestic Tax Authority [Member]
Income Tax Authority [Axis]
Preferred stock, shares issued (in shares)
Adjustments to reconcile net income to net cash provided by operating activities:
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)
Document Fiscal Period Focus
Document Fiscal Year Focus
Preferred stock, par value (in dollars per share)
Document Period End Date
us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Document Type
Statement of Cash Flows [Abstract]
us-gaap_OperatingIncomeLoss
Income from operations
us-gaap_UnrecognizedTaxBenefits
Balance at beginning of year
Balance at end of year
us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation
Foreign exchange rate impact
us-gaap_GrossProfit
Gross profit
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) [Member]
Information pertaining to restricted stock units and performance stock units.
Statement of Stockholders' Equity [Abstract]
Document Information [Line Items]
us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Reductions due to lapse of the statute of limitations
Document Information [Table]
Entity Public Float
Entity Filer Category
us-gaap_PropertyPlantAndEquipmentUsefulLife
Property, Plant and Equipment, Useful Life
Entity Current Reporting Status
us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Total
Cost of sales
Entity Voluntary Filers
Gross additions for tax positions of current year
Entity Well-known Seasoned Issuer
Gross additions for tax positions of prior years
Thereafter
2020
Other current assets
2021
2018
2019
2017
Building and Building Improvements [Member]
us-gaap_InventoryNet
Entity Central Index Key
Broadcast Microwave Services, Inc. (“BMS”) [Member]
Represents information about Broadcast Microwave Services,Inc., the Company's microwave communications equipment segment.
Entity Registrant Name
Land and Land Improvements [Member]
Building [Member]
Building Improvements [Member]
Cohu Electronics [Member]
Represents information about Cohu Electronics, the Company's video camera segment.
Entity [Domain]
Business Acquisition, Acquiree [Domain]
cohu_DisposalGroupIncludingDiscontinuedOperationContingentConsideration
Disposal Group, Including Discontinued Operation, Contingent Consideration
Maximum amount of contingent consideration receivable for the disposal of assets and liabilities, including discontinued operation.
Legal Entity [Axis]
Operating income (loss) before income taxes
Business Acquisition [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Policy [Policy Text Block]
Paid-in capital
Disposal Group Name [Domain]
us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High
us-gaap_TaxCreditCarryforwardAmount
Tax Credit Carryforward, Amount
Stockholders' equity:
Disposal Group Name [Axis]
Entity Common Stock, Shares Outstanding (in shares)
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
Inventory, Policy [Policy Text Block]
Disposal Groups, Including Discontinued Operations [Table Text Block]
PHILIPPINES
Cash flows from operating activities:
Statement [Line Items]
Inventories:
Accounts receivable, net
us-gaap_OperatingLossCarryforwards
Operating Loss Carryforwards
Trading Symbol
AOCI Attributable to Parent [Member]
us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Allowance for Doubtful Accounts Receivable, Current
Commitments and contingencies
SINGAPORE
Adjustments for New Accounting Principle, Early Adoption [Member]
Other comprehensive income (loss), net of tax
Other comprehensive loss, net of tax
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 3 [Member]
us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Other comprehensive income (loss), before tax
Fair Value Hierarchy [Domain]
us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Other comprehensive income (loss), tax
Fair Value, Inputs, Level 1 [Member]
Fair Value, Hierarchy [Axis]
Current assets:
us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Net increase (decrease) in cash and cash equivalents
Effect of exchange rate changes on cash and cash equivalents
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Investing cash flows of discontinued operations
us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Operating cash flows of discontinued operations
Change in unrealized gain/loss on investments, before tax
us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent
Adjustments related to postretirement benefits, before tax
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash used in financing activities
Type of Adoption [Domain]
Adjustments for New Accounting Pronouncements [Axis]
cohu_IncreaseDecreaseOfEarningPerShareDueToImpactOfTaxHolidays
Increase (Decrease) of Earning Per Share Due To Impact Of Tax Holidays
The increase or decrease of earning per share due to impact of tax holidays.
UNITED STATES
us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
us-gaap_ProductWarrantyAccrual
Beginning balance
Ending balance
Foreign currency translation adjustments, before tax
us-gaap_PaymentsOfDividendsCommonStock
Cash dividends paid
Net cash provided by (used in) issuance of common stock through employee equity incentive plans
Gross Unrealized Gains
Other, net
Change in valuation allowance
Gross Unrealized Losses
Amortized Cost
Equity Securities [Member]
us-gaap_StockholdersEquity
Total stockholders' equity
Balance
Balance
Retained Earnings [Member]
Additional Paid-in Capital [Member]
us-gaap_CostsAndExpenses
Noncurrent deferred gain on sale of facility
Range of Exercise Prices, Upper (in dollars per share)
Change in unrealized gain/loss on investments, net of tax
Change in unrealized gain/loss on investments
Cost and expenses:
Common Stock [Member]
Range of Exercise Prices, Lower (in dollars per share)
Equity Components [Axis]
Exercise Price Range [Axis]
Equity Component [Domain]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain]
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
us-gaap_DeferredRevenue
Deferred Revenue
Dividend yield
us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Adjustments related to postretirement benefits, net of tax
Adjustments related to postretirement benefits
Risk-free interest rate
Non-deductible transaction costs
Stock-based compensation on which no tax benefit provided
Expected volatility
us-gaap_BusinessCombinationConsiderationTransferred1
Business Combination, Consideration Transferred
Expected term (years) (Year)
us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Changes in cumulative translation adjustment
Foreign currency translation adjustments, net of tax
us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax
us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
Business Combination, Consideration Transferred, Liabilities Incurred
Other comprehensive loss, net of tax
us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Federal tax credits
Foreign income taxed at different rates
us-gaap_LineOfCredit
Long-term Line of Credit
Tax provision at U.S. 35% statutory rate
State income taxes, net of federal tax benefit
Cancelled, wt. avg. (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Outstanding, beginning of year, wt. avg. (in dollars per share)
Outstanding, end of year, wt. avg. (in dollars per share)
Cash and Cash Equivalents, Policy [Policy Text Block]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income from continuing operations, Foreign
Granted, wt. avg. (in dollars per share)
Released, wt. avg. (in dollars per share)
Significant Accounting Policies [Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Outstanding, beginning of year, units (in shares)
Outstanding, end of year, units (in shares)
Basis of Accounting, Policy [Policy Text Block]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Income from continuing operations, U.S.
Income Tax Disclosure [Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Cancelled, units (in shares)
Accounting Policies [Abstract]
Granted, units (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Released, units (in shares)
Due in one year or less, estimated fair value
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value
Machinery and Equipment [Member]
Balance Sheet Location [Domain]
Options Exercisable, Weighted Average Exercise Price (in dollars per share)
Options exercisable at year end (in dollars per share)
Balance Sheet Location [Axis]
Options Exercisable (in shares)
Options exercisable at year end (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Due in one year or less, amortized cost
Weighted-average grant date fair value per share (in dollars per share)
Selling, General and Administrative Expenses [Member]
Options Outstanding, Weighted Average Remaining Life (Year)
Earn-Out Cash Consideration [Member]
The amount of payments that will be owed to the selling entity if certain growth targets for revenue and profitability are met.
Options Outstanding, Weighted Average Exercise Price (in dollars per share)
Outstanding, beginning of year (in dollars per share)
Outstanding, end of year (in dollars per share)
cohu_DefinedBenefitPlanHealthCareCostTrendRateAnnualRateOfChange
Defined Benefit Plan, Health Care Cost Trend Rate, Annual Rate of Change
The annual rate of change (increase (decrease)) in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.
Cancelled (in dollars per share)
us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Granted (in dollars per share)
Cost of Sales [Member]
Exercised (in dollars per share)
Income Statement Location [Domain]
Research and Development Expense [Member]
Income Statement Location [Axis]
Maximum [Member]
Minimum [Member]
Range [Axis]
Range [Domain]
Cumulative effect of accounting change (a)
Cumulative Effect of New Accounting Principle in Period of Adoption
Cash dividend, per share (in dollars per share)
Customer [Axis]
Customer [Domain]
Number Outstanding (in shares)
Outstanding, beginning of year (in shares)
Outstanding, end of year (in shares)
Trade Names [Member]
Lease Arrangement, Type [Domain]
Lease Arrangement, Type [Axis]
us-gaap_OtherAccruedLiabilitiesNoncurrent
Other accrued liabilities
Schedule of Goodwill [Table Text Block]
us-gaap_ProductWarrantyAccrualNoncurrent
Product Warranty Accrual, Noncurrent
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
Goodwill and Intangible Assets Disclosure [Text Block]
Corporate Debt Securities [Member]
Foreign Government Debt Securities [Member]
Debt Securities [Member]
Available-for-sale Securities [Table Text Block]
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Operating Leases of Lessee Disclosure [Table Text Block]
Commitments Contingencies and Guarantees [Text Block]
Vesting [Axis]
Vesting [Domain]
Plan Name [Axis]
Effect of dilutive stock options and restricted stock units (in shares)
Plan Name [Domain]
us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
(in shares)
Diluted (in shares)
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition
Award Type [Axis]
Geographical [Axis]
Equity Award [Domain]
Geographical [Domain]
us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Income tax benefit
Loss from discontinued operations (in dollars per share)
us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Finite-Lived Intangible Assets by Major Class [Axis]
Net income (in dollars per share)
us-gaap_EarningsPerShareDiluted
Net income (loss) (in dollars per share)
Finite-Lived Intangible Assets, Major Class Name [Domain]
Contingent Consideration by Type [Axis]
Income from continuing operations (in dollars per share)
us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Income (loss) from continuing operations (in dollars per share)
Contingent Consideration Type [Domain]
Weighted average common shares outstanding (in shares)
Basic (in shares)
Scenario, Unspecified [Domain]
Diluted:
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income from continuing operations (in dollars per share)
Scenario [Axis]
us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Loss from discontinued operations (in dollars per share)
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
us-gaap_EarningsPerShareBasic
Net income (in dollars per share)
Related Party Transactions Disclosure [Text Block]
Basic:
Segments [Axis]
Segments [Domain]
cohu_InitialCashProceedsFromDivestitureOfBusinesses
Initial Cash Proceeds from Divestiture of Businesses
The initial cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period, not including contingent consideration or working capital adjustment.
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
Statement [Table]
Contingencies Disclosure [Text Block]
Impact of currency exchange
Income Statement [Abstract]
Net cash provided by (used in) investing activities
Cash flows from financing activities:
Condensed Statement of Comprehensive Income [Table Text Block]
Accrued retirement benefits
Deferred income taxes
Quarterly Financial Information [Table Text Block]
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Investments Classified by Contractual Maturity Date [Table Text Block]
Net cash received from sale of segment
Proceeds from Divestiture of Businesses
Investment Type [Axis]
Investments [Domain]
Noncurrent income tax liabilities
us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Income tax provision
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
us-gaap_PaymentsToAcquireBusinessesGross
Payments to Acquire Businesses, Gross
us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Gain (loss) on disposal of segment
us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
Gain (loss) from disposal of segment
us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax
Net sales
us-gaap_DividendsPayableCurrentAndNoncurrent
Dividends declared but not yet paid
Income tax provision
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income from continuing operations before taxes
Non-current Other Accrued Liabilities [Member]
Represents non-current other accrued liabilities.
us-gaap_LiabilitiesCurrent
Total current liabilities
Quarterly Financial Information [Text Block]
Class of Stock [Axis]
Sales and maturities of short-term investments
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Deferred profit
Other Deferred Credits, Current
us-gaap_DeferredCompensationLiabilityCurrent
Deferred Compensation Liability, Current
us-gaap_GainLossOnSaleOfProperties
Gain on sale of facility
us-gaap_PaymentsToAcquireShortTermInvestments
Purchases of short-term investments
Kita Manufacturing Co. LTD. and Kita USA, Inc. [Member]
Represent Kita Manufacturing Co. LTD. and Kita USA, Inc.
us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Defined Contribution Plan, Employer Discretionary Contribution Amount
us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay
us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Defined Contribution Plan, Employer Matching Contribution, Percent of Match
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
Vesting Over One Year Period [Member]
Represent a year vesting period.
Vesting Over Two Year Period [Member]
Represent two year vesting period.
Employer contributions
us-gaap_DefinedBenefitPlanSettlementsPlanAssets
Settlements
Vesting Over Four Year Period [Member]
Represent four year vesting period.
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Plan assets at end of year
Fair value of plan assets at beginning of year
Fair value of plan assets at end of year
Vest on the Third Anniversary of Awards Grant [Member]
Represent awards that are versing on the third anniversary of grant.
Income taxes payable
Accrued compensation and benefits
Equity-based Performance Stock Units Granted in 2016 [Member]
Represents equity-based performance stock units granted in 2016.
Vest on the Second and Third Anniversary of Awards Grant [Member]
Represent awards that are versing on the second and third anniversary of grant.
Accounts payable
Equity-based Performance Stock Units Granted in 2015 and 2014 [Member]
Represents equity-based performance stock units granted in 2015 and 2014.
Schedule of Net Benefit Costs [Table Text Block]
us-gaap_LeaseAndRentalExpense
Operating Leases, Rent Expense
Schedule of Net Funded Status [Table Text Block]
Subsequent Event [Member]
Capitalized facility under build-to-suit lease
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
cohu_AvailableforsaleSecuritiesDebtMaturitiesYearTwoThroughThreeFairValue
Due after one year through three years, estimated fair value
Fair value of available-for-sale debt securities maturing in the second fiscal year through the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
Subsequent Events [Text Block]
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]
cohu_AvailableforsaleSecuritiesDebtMaturitiesYearTwoThroughThreeAmortizedCostBasis
Due after one year through three years, amortized cost
Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the third fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
Cash paid (refunded) during the year for income taxes
Equity Incentive Plan 2005 [Member]
Information pertaining to the 2005 Equity Incentive Plan.
Schedule of Assumptions Used [Table Text Block]
Supplemental disclosure of cash flow information:
Schedule of Share-based Compensation, Equity-based Performance Stock Units [Table Text Block]
Tabular disclosure of equity-based performance stock units.
Accrued warranty
Range of Award
The percent of the original grant of equity-based compensation awards that may be granted as part of a performance-based equity compensation program.
Other accrued liabilities
us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation
us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components
Equity-based Performance Stock Units Granted in 2014 [Member]
Represents equity-based performance stock units granted in 2014.
us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation
Performance Criteria Period (Year)
In a performance-based equity compensation plan, the timing in which performance goals are set relative to the grant date.
us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components
Equity-based Performance Stock Units Granted in 2015 [Member]
Represents equity-based performance stock units granted in 2015.
us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate
us-gaap_DefinedBenefitPlanYearThatRateReachesUltimateTrendRate
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate
us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year
Range 1 [Member]
Information by range of option prices pertaining to options granted.
Discontinued operations
The amount of expense related to discontinued operations for equity-based payment arrangements recognized during the period.
Range 3 [Member]
Information by range of option prices pertaining to options granted.
Range 2 [Member]
Information by range of option prices pertaining to options granted.
cohu_OwnershipPercentageOfTheCompany
Ownership Percentage of the Company
The percentage of ownership of common stock or equity of the company.
NXP Semiconductors N.V. [Member]
Information pertaining to NXP Semiconductors N.V.
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of property, plant and equipment
us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year
cohu_IncreaseDecreaseOfNetIncomeDueToImpactOfTaxHolidays
Increase (Decrease) of Net Income Due to Impact of Tax Holidays
Increase (decrease) in net income due to the impact of tax holidays.
Blackrock [Member]
Represents the entity of Blackrock, a related party of the company.
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Plan and Other Postretirement Benefit Plan [Domain]
Current liabilities:
Sale-leaseback of Poway Facility [Member]
Information pertaining to the sale-leaseback of Poway Facility.
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
Defined Benefit Plan, Expected Future Benefit Payments, Year Five
Lease 1 [Member]
Information pertaining to the first lease.
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter
us-gaap_Assets
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
Defined Benefit Plan, Expected Future Benefit Payments, Year Three
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
Defined Benefit Plan, Expected Future Benefit Payments, Year Four
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months
cohu_SaleLeasebackTransactionDeferredGainAmortizationPeriod
Sale Leaseback Transaction, Deferred Gain, Amortization Period
The amortization period of the deferred gain in a sale leaseback transaction.
us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
Defined Benefit Plan, Expected Future Benefit Payments, Year Two
cohu_PercentageOfFacilityToBeConsolidated
Percentage of Facility to be Consolidated
Represents the percentage area of the facility to be occupied.
us-gaap_BusinessCombinationAcquisitionRelatedCosts
Business Combination, Acquisition Related Costs
cohu_LesseeLeasingArrangementsOperatingLeasesAdjustmentsAndProRataShareOfPropertyOperatingCosts
Lessee Leasing Arrangements, Operating Leases, Adjustments and Pro Rata Share of Property Operating Costs
Term of the lessee's leasing arrangement providing a percentage of annual adjustments for inflation and a pro rata share of property operating costs.
us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
Settlements
us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
Defined Benefit Plan, Target Plan Asset Allocations
Weighted average shares used in computing income (loss) per share:
us-gaap_GoodwillImpairmentLoss
Goodwill, Impairment Loss
cohu_ContingentConsiderationReceivableFairValue
Contingent Consideration Receivable, Fair Value
Represents contingent consideration receivable fair value.
cohu_LesseeLeasingArrangementsOperatingLeasesNumberOfRenewalOptions
Lessee Leasing Arrangements, Operating Leases, Number of Renewal Options
Represents the lessee operating lease arrangement number of renewal options.
us-gaap_AmortizationOfIntangibleAssets
Amortization of Intangible Assets
Rate of return on Assets
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
Compensation increase
Machinery, Equipment and Software [Member]
Tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment and collection of computer programs and related data that provide instructions to a computer.
Intangible assets, net
Discount rate
us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Money Market Funds [Member]
Accumulated Amortization
cohu_PercentageOfRevenueRecognizedUponShipmentAndPassageOfTitle
Percentage of Revenue Recognized upon Shipment and Passage of Title
The percentage of revenue recognized upon shipment and passage of title.
Compensation increase
Discount rate
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate
Gross Carrying Amount
Net cash received from sale of facility and assets
Sale Leaseback Transaction, Net Proceeds, Investing Activities
Cash and Cash Equivalents [Domain]
Cash [Member]
us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities
Sale Leaseback Transaction, Gross Proceeds, Investing Activities
Cash and Cash Equivalents [Axis]
Net income
Net income
Net income (loss)
Interest cost
Interest cost
Interest cost
us-gaap_IncomeLossFromContinuingOperations
Income from continuing operations
Income (loss) from continuing operations
us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Expected return on assets
Loss, net of tax
Loss from discontinued operations, net of tax
Service cost
Service cost
Restricted Stock Units (RSUs) [Member]
us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Accumulated benefit obligation at beginning of year
Accumulated benefit obligation at end of year
Goodwill
Beginning balance
Ending balance
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Less accumulated depreciation and amortization
Property plant and equipment, net
Property, plant and equipment, net
Property plant and equipment, net
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
Employee Stock Option [Member]
Property, plant and equipment
us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax
Funded status
Net liability at end of year
Selling, general and administrative
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
Return on assets, net of actuarial loss
Raw materials and purchased parts
Work in process
Fair Value, Measurements, Recurring [Member]
Finished goods
Benefits paid
Benefits paid
Benefits paid
Measurement Frequency [Axis]
Fair Value, Measurement Frequency [Domain]
us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets
Foreign currency exchange adjustment
New Accounting Pronouncements, Policy [Policy Text Block]
Participant contributions
Participant contributions
Net cash provided by operating activities
us-gaap_DefinedBenefitPlanBenefitObligation
Benefit obligation at beginning of year
Benefit obligation at end of year
Cash flows from investing activities, excluding effects from acquisitions and divestitures:
Research and development
us-gaap_NumberOfOperatingSegments
Number of Operating Segments
Settlements
us-gaap_AvailableForSaleSecuritiesDebtSecurities