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Note 26 - Earnings (Loss) Per Common Share (Details Textual)	12 Months Ended
	Dec. 31, 2020
Redeemable Non-controlling Interest Membership Units Not Held Share Ratio	10

X

- Definition

Represents redeemable non-controlling interest membership units not held share ratio.

+ References

No definition available.

+ Details

Name:	cohn_RedeemableNoncontrollingInterestMembershipUnitsNotHeldShareRatio
Namespace Prefix:	cohn_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration