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Revenue Recognition (Narrative) (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Revenue from Contract with Customer [Abstract] |  |
Stock borrow / stock loan | $ 444,000 | $ 581,000
Gross revenue from stock borrow/ Stock loan | 1,663,000 | 3,439,000
Expenses from stock borrow/stock loan | 1,219,000 | $ 2,858,000
Client expenses | 218,000 |
Other receivables | 16,000 |
Accounts payable and accrued liabilities | $ 186,000 |

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