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Equity (Schedule Of Effects Of Changes In Ownership Interest Subsidiary) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Equity [Abstract] |  |  |  |
Net income (loss) attributable to Cohen & Company Inc. | $ (651) | $ (547) | $ (2,045) | $ 551
Increase / (decrease) in Cohen & Company Inc. paid in capital for the acquisition / (surrender) of additional units in consolidated subsidiary, net |  |  | (139) | 153
Changes from net income / (loss) attributable to Cohen & Company Inc. and transfers (to) from non-controlling interest |  |  | $ (2,184) | $ 704

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