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Note 11 - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 27, 2026	Dec. 27, 2025
Operating lease assets	$ 27,715	$ 29,271	[1]
Finance lease assets	40	68
Total lease assets	27,755	29,339
Operating	4,301	3,100
Operating	30,713	31,693
Total lease liabilities	$ 35,014	$ 34,793
Operating leases (Year)	8 years 8 months 12 days	9 years
Operating leases	6.50%	6.50%
[1] Derived from December 27, 2025, audited financial statements

X

- Definition

Present value of lessee's discounted obligation for lease payments from finance and operating lease.

+ References

No definition available.

+ Details

Name:	cohu_LeaseLiability
Namespace Prefix:	cohu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under finance and operating lease.

+ References

No definition available.

+ Details

Name:	cohu_LeaseRightofuseAsset
Namespace Prefix:	cohu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after accumulated amortization, of right-of-use asset from finance lease.

+ References

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-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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-Publisher FASB
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+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

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X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

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Namespace Prefix:	us-gaap_
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X

- Definition

Weighted average discount rate for operating lease calculated at point in time.

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Period Type:	instant

X

- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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