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Revenue Recognition (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Revenue from Contract with Customer [Abstract] |  |  |  |
Stock borrow / stock loan | $ 3,465,000 | $ 1,267,000 | $ 7,552,000 | $ 2,482,000
Gross revenue from stock borrow/ Stock loan | 7,754,000 | 2,499,000 | 19,605,000 | 6,170,000
Expenses from stock borrow/stock loan | 4,289,000 | 1,232,000 | 12,053,000 | 3,688,000
Client expenses | 170,000 | $ 142,000 | 500,000 | $ 494,000
Other receivables | 33,000 |  | 33,000 |
Accounts payable and accrued liabilities | $ 261,000 |  | $ 261,000 |

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