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Revenue Recognition (Schedule of Major Revenue Categories) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Trading Execution and Clearing Services |  |  |
Commissions and fees | $ 20,179,000 | $ 9,750,000 | [1]
Principal transactions | 11,850,000 | 9,018,000 | [1]
Market making | 2,042,000 | 1,744,000 |
Stock borrow / stock loan | 4,045,000 | 1,607,000 |
Advisory fees | 1,142,000 | 801,000 |
Total Trading Execution and Clearing Services | 39,258,000 | 22,920,000 |
Margin interest, marketing and distribution fees |  |  |
Margin interest | 8,725,000 | 11,502,000 |
12b1 fees | 1,458,000 | 3,208,000 |
Total Margin interest, marketing and distribution fees | 10,183,000 | 14,710,000 | [1]
Interest income | 4,012,000 | 4,235,000 |
Other income | 1,419,000 | 912,000 | [1]
Total Other Income | 15,614,000 | 19,857,000 |
Total Revenue | $ 54,872,000 | $ 42,777,000 | [1]
[1] | Statement of income for the year ended December 31, 2019 represents the pro forma combination of Siebert and StockCross balances. See "Note 3 - Acquisitions" for additional detail.

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