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Note 10 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Equity Option [Member] | Short [Member]
Derivative, Notional Amount	$ 0	$ 1,595
TBA and Other Forward MBS [Member] | Short [Member]
Derivative, Notional Amount	1,283,850	1,809,550
TBA and Other Forward MBS [Member] | Long [Member]
Derivative, Notional Amount	1,243,250	1,706,834
Other Extended Settlement Trade [Member] | Short [Member]
Derivative, Notional Amount	0	0
Other Extended Settlement Trade [Member] | Long [Member]
Derivative, Notional Amount	0	365
Foreign Exchange Forward [Member]
Derivative, Notional Amount	$ 0	$ 0

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_StockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PositionAxis=us-gaap_ShortMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=cohn_TBAAndOtherForwardMbsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PositionAxis=us-gaap_LongMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=cohn_OtherExtendedSettlementTradeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: