v3.25.4

Note 10 - Derivative Financial Instruments - Share Forward Arrangements (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Share forward arrangements, fair value | $ 0 | $ 470
Equity Securities [Member] |  |
Share forward arrangements, fair value | $ 0 | $ 470

X
- Definition The fair value of assets (liabilities) of share forward arrangements. + References No definition available. + Details
Name: | cohn_ShareForwardArrangementsAssetLiabilityFairValue
Namespace Prefix: | cohn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |