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Note Payables - Related Party (Schedule of Notes Payable) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
4.00% due May 31, 2021 [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Issuance Date |  | Dec. 01, 2020 |
Notes payable - related party |  | $ 2,200,000 |
Unpaid Principal Amount |  | $ 2,200,000 |
4% due November 30, 2021 [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Issuance Date | [1] | Nov. 30, 2020 |
Notes payable - related party | [1] | $ 3,000,000 |
Unpaid Principal Amount | [1] | 3,000,000 |
4.00% due December 2, 2020 [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Issuance Date |  |  | Dec. 02, 2019
Notes payable - related party |  |  | $ 3,000,000
Unpaid Principal Amount |  |  | $ 3,000,000
2.75% due November 30, 2020 [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Issuance Date | [2] |  | Nov. 30, 2018
Notes payable - related party | [2] |  | $ 3,000,000
Unpaid Principal Amount | [2] |  | $ 3,000,000
1.75% due September 4, 2020 [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Issuance Date | [2] |  | Sep. 04, 2020
Notes payable - related party | [2] |  | $ 2,000,000
Unpaid Principal Amount | [2] |  | 2,000,000
Related Party Debt [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Notes payable - related party |  | 5,200,000 | 8,000,000
Unpaid Principal Amount |  | $ 5,200,000 | $ 8,000,000
[1] | This note payable is subordinated to MSCO and is subordinated to the claims of general creditors, approved by FINRA, and are included in MSCO's calculation of net capital and the capital requirements under FINRA and SEC regulations.
[2] | These notes payable are subordinated to MSCO and are subordinated to the claims of general creditors, approved by FINRA, and are included in MSCO's calculation of net capital and the capital requirements under FINRA and SEC regulations. Subsequently, a rate adjustment was completed on March 3, 2020. These notes were acquired as part of the transaction with StockCross and no consideration was paid or received as part of the renegotiation. MSCO subsequently repaid the notes on September 4, 2020 and November 30, 2020, respectively.

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