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Notes Payable - Related Party (Schedule of Notes Payable) (Details) | 9 Months Ended
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Sep. 30, 2020 USD ($)
Short-term Debt [Line Items] |  |
Notes payable - related party | $ 6,000,000 |
4% due December 2, 2020 [Member] |  |
Short-term Debt [Line Items] |  |
Issuance Date | Dec. 02, 2019 |
Notes payable - related party | $ 3,000,000 |
4% due November 30, 2021 [Member] | Subordinated to MSCO [Member] |  |
Short-term Debt [Line Items] |  |
Issuance Date | Nov. 30, 2018 | [1],[2]
Notes payable - related party | $ 3,000,000 |
[1] | The note payable subordinated to MSCO was acquired as part of the acquisition of StockCross.
[2] | This note payable was renewed on November 30, 2019 for a term of one year. Subsequently, a rate adjustment and extension of its maturity with permissive prepayment was completed on March 3, 2020.

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