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Note 16 - Related Party Transactions (Details Textual) | Dec. 31, 2022
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Blackrock [Member] |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 15.90%

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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_OwnershipAxis=cohu_BlackrockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |