Notes Payable - Related Party (Schedule of Notes Payable) (Details) - USD ($)		3 Months Ended	12 Months Ended
		Mar. 31, 2021	Dec. 31, 2020
4.00% due May 31, 2021 [Member]
Short-term Debt [Line Items]
Issuance Date		Dec. 01, 2020	Dec. 01, 2020
Notes payable - related party		$ 2,200,000	$ 2,200,000
Unpaid Principal Amount		$ 2,200,000	$ 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
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 are included in MSCO’s calculation of net capital and the capital requirements under FINRA and SEC regulations.