v3.25.1
FAIR VALUE OF FINANCIAL INSTRUMENTS - UNL's Securities Fair Value Hierarchy (Details) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
US    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value $ 3,344,114 $ 1,115,220
Short-Term Investments    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value 10,000,000 11,000,000
Level 1 | US    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value 3,344,114 1,115,220
Level 1 | Short-Term Investments    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value $ 10,000,000 $ 11,000,000