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Revenue Recognition (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |  |
Stock borrow / stock loan | $ 4,045,000 | $ 1,607,000
Gross revenue from stock borrow/ Stock loan | 10,068,000 | 10,137,000
Expenses from stock borrow/stock loan | 6,023,000 | 8,530,000
Client expenses | 693,000 | 48,000
Other receivables | 4,000 | 31,000
Accounts payable and accrued liabilities | $ 230,000 | $ 158,000

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