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Notes Payable - Related Party (Schedule of Notes Payable) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | [1]
Notes payable - related party |  | $ 8,000,000 | $ 8,000,000
Subordinated to MSCO [Member] |  |  |
Notes payable - related party | [2] | $ 5,000,000 |
4% due December 2, 2020 [Member] |  |  |
Issuance Date |  | Dec. 02, 2019 |
Notes payable - related party |  | $ 3,000,000 |
4% due November 30, 2020 [Member] | Subordinated to MSCO [Member] |  |  |
Issuance Date | [2],[3] | Nov. 30, 2018 |
Notes payable - related party | [2],[3] | $ 3,000,000 |
4% due September 4, 2020 [Member] | Subordinated to MSCO [Member] |  |  |
Issuance Date | [2] | Sep. 04, 2019 |
Notes payable - related party | [2] | $ 2,000,000 |
[1] | Statement of financial condition as of December 31, 2019 represents the pro forma combination of Siebert and StockCross balances. See "Note 3 - Acquisitions" for additional detail.
[2] | The notes payable subordinated to MSCO were acquired as part of the acquisition of StockCross
[3] | This note payable was renewed on November 30, 2019 for a term of one year

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