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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 + Details
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