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FAIR VALUE OF FINANCIAL INSTRUMENTS - UNL's Securities Fair Value Hierarchy (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
United States    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value $ (6,818,550) $ 548,509
Short-Term Investments    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value 37,550,000 14,000,000
Fair Value, Inputs, Level 1 | United States    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value (6,818,550) 548,509
Fair Value, Inputs, Level 1 | Short-Term Investments    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value 37,550,000 14,000,000
Fair Value, Inputs, Level 2 | United States    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value 0 0
Fair Value, Inputs, Level 2 | Short-Term Investments    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value 0 0
Fair Value, Inputs, Level 3 | United States    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value 0 0
Fair Value, Inputs, Level 3 | Short-Term Investments    
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Securities, fair value $ 0 $ 0