XML 99 R84.htm IDEA: XBRL DOCUMENT v3.20.4

Note 9 - Fair Value Disclosures (Details Textual) - Other Investment [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ 43,413	$ 1,080	$ 2,616
Other Investment Sold, Not yet Purchased, Gain (Loss)	$ 1,063	$ 0	$ 0

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:	instant

X

- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612

+ Details

Name:	us-gaap_FairValueOptionChangesInFairValueGainLoss1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=cohn_OtherInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: