v3.25.4

Note 12 - Investments in Equity Method Affiliates (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Payments to Acquire Equity Method Investments, Including Noncash Transfer | $ 3,467 | $ 236 | $ 1,896
Columbus Circle SPAC [Member] |  |  |
Payments to Acquire Equity Method Investments, Including Noncash Transfer | $ 3,467 | $ 0 | $ 0

X
- Definition The outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. Including noncash transfers. + References No definition available. + Details
Name: | cohn_PaymentsToAcquireEquityMethodInvestmentsIncludingNoncashTransfer
Namespace Prefix: | cohn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cohn_ColumbusCircleSpacMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |