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: