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Note 10 - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 30, 2024	Jun. 29, 2024	Jul. 01, 2023	Dec. 30, 2023
Lessee, Operating Lease, Renewal Term (Year)		25 years
Finance Lease, Right-of-Use Asset, Accumulated Amortization		$ 400		$ 300
Increase (Decrease) in Operating Lease Liability		(3,215)	$ (3,357)
Increase (Decrease) in Operating Lease, Right-of-Use Assets		(3,202)	$ (3,536)
Leased Facility in Malaysia [Member]
Payments to Acquire Productive Assets	$ 8,800
Increase (Decrease) in Operating Lease Liability		(400)
Increase (Decrease) in Finance Lease Assets		8,800
Increase (Decrease) in Finance Lease Liability		7,900
Increase (Decrease) in Operating Lease, Right-of-Use Assets		$ (400)
Minimum [Member]
Lessee, Lease, Remaining Term of Contract (Year)		1 year
Maximum [Member]
Lessee, Lease, Remaining Term of Contract (Year)		34 years

X

- Definition

Represents the amount of increase (decrease) in finance lease assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	cohu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Represents the amount of increase (decrease) in finance lease liability.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Amount of increase (decrease) in operating lease right-of-use assetS.

+ References

No definition available.

+ Details

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Namespace Prefix:	cohu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Remaining term of lessee's operating and finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in obligation for operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-SubTopic 20
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480060/805-50-25-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480027/805-50-30-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
-Name Accounting Standards Codification
-Section 30
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480027/805-50-30-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (c)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

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- Details

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