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FAIR VALUE OF FINANCIAL INSTRUMENTS - UNL's Securities Fair Value Hierarchy (Details) - USD ($)
Jun. 30, 2025
Dec. 31, 2024
US    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value $ 390,476 $ 1,115,220
Short-Term Investments    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value 7,000,000 11,000,000
Level 1 | US    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value 390,476 1,115,220
Level 1 | Short-Term Investments    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value $ 7,000,000 $ 11,000,000