FAIR VALUE MEASUREMENTS (Details) - Level 1 - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Adjusted cost	$ 36,018	$ 41,012
Unrealized gains	17	15
Unrealized losses	0	0
Market value	36,035	41,027
Money Market Funds
Adjusted cost	1,035	6,035
Unrealized gains	0	0
Unrealized losses	0	0
Market value	1,035	6,035
U.S. Treasury Securities Considered Cash Equivalents
Adjusted cost	0	9,998
Unrealized gains	0	0
Unrealized losses	0	0
Market value	0	9,998
U.S. Treasury Securities in Short-term Investments
Adjusted cost	34,983	24,979
Unrealized gains	17	15
Unrealized losses	0	0
Market value	$ 35,000	$ 24,994

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant