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Note 19 - Redeemable Financial Instruments - Redeemable Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Oct. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Redeemable financial instruments | $ 11,957 |  | $ 16,983
JKD Capital Partners I, LTD [Member] |  |  |
Redeemable financial instruments | 7,957 |  | 7,957
DGC Trust/CBF [Member] |  |  |
Redeemable financial instruments | 4,000 | $ 4,000 | 8,500
ViaNova Capital Group, LLC [Member] |  |  |
Redeemable financial instruments |  |  | $ 526

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

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

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cohn_DGCTrustCBFMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cohn_VianovaCapitalGroupLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |