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Note 9 - Derivative Financial Instruments - Share Forward Arrangements (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Share forward arrangements, fair value	$ (1,384)	$ 9,159
Equity Securities [Member]
Share forward arrangements, fair value	2,284	26,079
Equity Derivatives [Member]
Share forward arrangements, fair value	804	1,447
Fair Value Receivables [Member]
Share forward arrangements, fair value	2,538	6,278
Share Forward Liabilities [Member]
Share forward arrangements, fair value	$ (7,010)	$ (24,645)

X

- Definition

The fair value of assets (liabilities) of share forward arrangements.

+ References

No definition available.

+ Details

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

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: