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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