v3.25.4

Note 12 - Investments in Equity Method Affiliates (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Payments to Acquire Equity Method Investments, Including Noncash Transfer	$ 3,467	$ 236	$ 1,896
Columbus Circle SPAC [Member]
Payments to Acquire Equity Method Investments, Including Noncash Transfer	$ 3,467	$ 0	$ 0

X

- Definition

The outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. Including noncash transfers.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cohn_ColumbusCircleSpacMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: