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Note 7 - Financial Instruments - Financial Instruments Sold, Not Yet Purchased (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Trading securities sold, not yet purchased	$ 47,719	$ 65,751
Other investments sold, not yet purchased	7,590	24,742
US Government Agencies Debt Securities [Member]
Trading securities sold, not yet purchased	1	0
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Trading securities sold, not yet purchased	95	0
US Treasury Securities [Member]
Trading securities sold, not yet purchased	24,445	34,284
Corporate Bonds and Redeemable Preferred Stock [Member]
Trading securities sold, not yet purchased	22,673	24,355
Equity Securities [Member]
Trading securities sold, not yet purchased	67	393
Other investments sold, not yet purchased	580	97
Derivative [Member]
Trading securities sold, not yet purchased	438	6,719
Share Forward Liabilities [Member]
Other investments sold, not yet purchased	$ 7,010	$ 24,645

X

- Definition

Represents other investment sold not yet purchased.

+ References

No definition available.

+ Details

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

X

- Definition

Fair value of obligations incurred from short sales.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 940
-SubTopic 320
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479035/940-320-45-2

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Balance Type:
Period Type:

X

- Details

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