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Revenue Recognition (Schedule of Major Revenue Categories) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Trading Execution and Clearing Services        
Commissions and fees $ 4,679,000 $ 2,273,000 $ 15,149,000 $ 7,132,000
Principal transactions 2,342,000 2,327,000 8,126,000 6,138,000
Market making 423,000 330,000 1,508,000 1,303,000
Stock borrow / stock loan 1,267,000 349,000 2,482,000 1,353,000
Advisory fees 305,000 211,000 810,000 572,000
Total Trading Execution and Clearing Services 9,016,000 5,490,000 28,075,000 16,498,000
Margin interest, marketing and distribution fees        
Margin interest 2,130,000 3,068,000 6,465,000 8,755,000
12b1 fees 181,000 844,000 1,265,000 2,406,000
Total Margin interest, marketing and distribution fees 2,311,000 3,912,000 7,730,000 11,161,000
Interest income 915,000 1,061,000 3,155,000 3,417,000
Other income 333,000 290,000 1,035,000 633,000
Total Other Income 3,559,000 5,263,000 11,920,000 15,211,000
Total Revenue $ 12,575,000 $ 10,753,000 $ 39,995,000 $ 31,709,000