XML 82 R71.htm IDEA: XBRL DOCUMENT
v3.10.0.1

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: |