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Note 19 - Redeemable Financial Instruments - Redeemable Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Redeemable financial instruments	$ 7,957	$ 11,957
JKD Capital Partners I, LTD [Member]
Redeemable financial instruments	7,957	7,957
CBF [Member]
Redeemable financial instruments	$ 0	$ 4,000

X

- Definition

Amount of redeemable financial instruments.

+ References

No definition available.

+ Details

Name:	cohn_RedeemableFinancialInstruments
Namespace Prefix:	cohn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cohn_JKDCapitalPartnersILTDMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cohn_CBFMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: