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Note 8 - Fair Value Disclosures (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Other Investment Sold, Gain (Loss), Fair Value	$ (19,136)	$ (11,376)	$ (48,060)	$ (13,979)
Other Investment Sold, Not yet Purchased, Gain (Loss)	$ 11,573	$ 23,046	$ 20,999	$ 23,051

X

- Definition

Represents fair value of gain (loss) for other investment.

+ References

No definition available.

+ Details

Name:	cohn_OtherInvestmentSoldGainLossFairValue
Namespace Prefix:	cohn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents realized and unrealized gain (loss) for other investment sold not yet purchased.

+ References

No definition available.

+ Details

Name:	cohn_OtherInvestmentSoldNotYetPurchasedGainLoss
Namespace Prefix:	cohn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration