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FAIR VALUE OF FINANCIAL INSTRUMENTS - USO's Securities Fair Value Hierarchy (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
United States [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	$ (26,921)	$ (21,964)
Short-Term Investments [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	7,000,000	1,000,000
Fair Value, Inputs, Level 1 [Member] | United States [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	(26,921)	(21,964)
Fair Value, Inputs, Level 1 [Member] | Short-Term Investments [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	$ 7,000,000	$ 1,000,000

X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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