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Note 15 - Redeemable Financial Instruments (Details Textual) - USD ($) $ in Thousands	Feb. 13, 2023	Oct. 03, 2016
Investment Agreement, Team Expenses Per Quarter	$ 150	$ 175
Investment Agreement, Team Expenses Annually	$ 600	$ 700

X

- Definition

Annual team expenses for Investment Agreement.

+ References

No definition available.

+ Details

Name:	cohn_InvestmentAgreementTeamExpensesAnnually
Namespace Prefix:	cohn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Term expenses per quarter for Investment Agreement.

+ References

No definition available.

+ Details

Name:	cohn_InvestmentAgreementTeamExpensesPerQuarter
Namespace Prefix:	cohn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration