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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: