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Note 8 - Financial Instruments - Trading Securities Sold, Not Yet Purchased (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities sold, not yet purchased | $ 44,439 | $ 77,947
Other investment sold, not yet repurchased, cost | 7,561 |
Other investments sold, not yet purchased | 7,415 |
Other investment sold, not yet repurchased, unrealized gain (loss) | 146 |
Derivative [Member] |  |
Investment securities sold, not yet purchased | 11,822 | 3,017
Other investment sold, not yet repurchased, cost | 338 |
Other investments sold, not yet purchased | 233 |
Other investment sold, not yet repurchased, unrealized gain (loss) | 105 |
Corporate Bonds and Redeemable Preferred Stock [Member] |  |
Investment securities sold, not yet purchased | 29,206 | 58,083
Equity Securities [Member] |  |
Investment securities sold, not yet purchased | 43 |
Other investment sold, not yet repurchased, cost | 7,223 |
Other investments sold, not yet purchased | 7,182 |
Other investment sold, not yet repurchased, unrealized gain (loss) | 41 |
Municipal Bonds [Member] |  |
Investment securities sold, not yet purchased | 20 | 20
US Treasury Securities [Member] |  |
Investment securities sold, not yet purchased | $ 3,348 | $ 16,827

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- Definition Represents other instruments sold not yet purchased at fair value. + References No definition available. + Details
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Namespace Prefix: | cohn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents other investment sold not yet purchased. + References No definition available. + Details
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- Definition Represents unrealized gain (loss) for other investment sold not yet purchased. + References No definition available. + Details
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- Definition Fair value of obligations incurred from short sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35711043&loc=d3e42429-110968 + Details
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