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FAIR VALUE OF FINANCIAL INSTRUMENTS - UNL's Securities Fair Value Hierarchy (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
United States Contracts    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value $ (1,984,757) $ (4,450,405)
Short-Term Investments    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value 11,000,000 11,000,000
Level 1 | United States Contracts    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value (1,984,757) (4,450,405)
Level 1 | Short-Term Investments    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value $ 11,000,000 $ 11,000,000