v3.25.4

Note 25 - Net Capital Requirements - Statutory Net Capital Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Actual Net Capital or Liquid Capital | $ 79,119 | $ 49,988
Amount Required | 964 | 893
Excess | 78,155 | 49,095
Cohen Securities [Member] |  |
Actual Net Capital or Liquid Capital | 77,093 | 48,414
Amount Required | 250 | 250
Excess | 76,843 | 48,164
CCFESA [Member] |  |
Actual Net Capital or Liquid Capital | 2,026 | 1,574
Amount Required | 714 | 643
Excess | $ 1,312 | $ 931

X
- Definition Amount of net capital in excess of minimum required net capital, calculated under Aggregate Indebtedness Standard. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Rule 15c3-1 -Number 240 -Section 15c3-1 -Publisher SEC + Details
Name: | srt_ExcessNetCapitalAt1500Percent
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of net capital required to be maintained by broker-dealer and its subsidiary, calculated under Aggregate Indebtedness Standard. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Rule 15c3-1 -Number 240 -Section 15c3-1 -Publisher SEC + Details
Name: | srt_MinimumNetCapitalRequired1
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of net capital of broker-dealer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Rule 15c3-1 -Number 240 -Section 15c3-1 -Publisher SEC + Details
Name: | srt_NetCapital
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=cohn_CohenSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cohn_CCFESAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |