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FAIR VALUE OF FINANCIAL INSTRUMENTS - UNL's Securities Fair Value Hierarchy (Details) - USD ($) | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
US |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | $ (458,945) | $ (4,450,405)
Short-Term Investments |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | 11,000,000 | 11,000,000
Level 1 | US |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | (458,945) | (4,450,405)
Level 1 | Short-Term Investments |  |
FAIR VALUE OF FINANCIAL INSTRUMENTS |  |
Securities, fair value | $ 11,000,000 | $ 11,000,000

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