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FAIR VALUE OF FINANCIAL INSTRUMENTS - UNL's Securities Fair Value Hierarchy (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	$ (4,450,405)	$ (8,419,740)
Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	11,000,000	22,000,000
Level 1 | United States Contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	(4,450,405)	(8,419,740)
Level 1 | Short-Term Investments
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	$ 11,000,000	$ 22,000,000

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- 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
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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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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