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Note 5 - Financial Instruments Measured at Fair Value (Details Textual) - USD ($) $ in Millions | Sep. 24, 2022 | Dec. 25, 2021
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Amortized Cost | $ 119.3 | $ 57.0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | $ 118.4 | $ 57.0

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- Definition Amount of investment in debt security measured at amortized cost, in unrealized loss position. + References No definition available. + Details
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Namespace Prefix: | cohu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant