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Revenue Recognition (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenue from Contract with Customer [Abstract] |  |  |  |
Stock borrow / stock loan | $ 1,267,000 | $ 349,000 | $ 2,482,000 | $ 1,353,000
Gross revenue from stock borrow/ Stock loan | 2,499,000 | 2,111,000 | 6,170,000 | 8,381,000
Expenses from stock borrow/stock loan | 1,232,000 | $ 1,762,000 | 3,688,000 | $ 7,028,000
Client expenses | 142,000 |  | 494,000 |
Other receivables | 5,000 |  | 5,000 |
Accounts payable and accrued liabilities | $ 150,000 |  | $ 150,000 |

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