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Note 21 - Equity - Schedule of Effects of Changes in Ownership Interest Subsidiary (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income / (loss) attributable to Cohen & Company Inc. $ 14,751 $ 1,655 $ 901 $ (3,102) $ 774 $ (1,216) $ (410) $ (1,202) $ 14,205 $ (2,054) $ (2,463)
Increase / (decrease) in Cohen & Company Inc.'s paid in capital for the acquisition / (surrender) of additional units in consolidated subsidiary, net                 (1,765) 28 (217)
Changes from net income / (loss) attributable to Cohen & Company Inc. and transfers (to) from non-controlling interest                 $ 12,440 $ (2,026) $ (2,680)