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Redeemable Financial Instruments (Schedule Of Redeemable Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 29, 2017	Jan. 31, 2017	Oct. 03, 2016
Related Party Transaction [Line Items]
Outstanding balance	$ 16,732	$ 16,732
Accrued Interest	493	398
JKD Investor [Member]
Related Party Transaction [Line Items]
Outstanding balance	6,732	6,732		$ 1,000	$ 6,000
Accrued Interest	415	367
DGC Family Fintech Trust/CBF [Member]
Related Party Transaction [Line Items]
Outstanding balance	10,000	10,000	$ 10,000
Accrued Interest	$ 78	$ 31

X

- Definition

Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Accrued Interest

+ References

No definition available.

+ Details

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

X

- Definition

Investment made by affiliated Investors who receive a return on their Investment.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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