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Note 4 - Restructuring Charges (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023
MCT Integration Program [Member] |  |
Restructuring Expenses | $ 0.7 | $ 2.0

X
- Definition The amount of expenses associated with restructuring. + References No definition available. + Details
Name: | cohu_RestructuringExpenses
Namespace Prefix: | cohu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RestructuringPlanAxis=cohu_MCTIntegrationProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |