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Notes Payable - Related Party (Schedule of Notes Payable) (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
4.00% due September 30, 2021 [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Issuance Date |  | May 31, 2021 |
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 | Nov. 30, 2020
Notes payable - related party | [1] | $ 3,000,000 | $ 3,000,000
Unpaid Principal Amount | [1] | 3,000,000 | $ 3,000,000
4.00% due May 31, 2021 [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Issuance Date | [2] |  | Dec. 01, 2020
Notes payable - related party | [2] |  | $ 2,200,000
Unpaid Principal Amount | [2] |  | 2,200,000
Related Party Debt [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Notes payable - related party |  | 5,200,000 | 5,200,000
Unpaid Principal Amount |  | $ 5,200,000 | $ 5,200,000
[1] | This note payable is subordinated to MSCO and is subordinated to the claims of general creditors, approved by FINRA, and is included in MSCO’s calculation of net capital and the capital requirements under FINRA and SEC regulations.
[2] | On May 31, 2021, this note payable was renewed with a maturity of September 30, 2021.

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