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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2022
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS          
Estimated directors fees and expenses $ 3,619 $ 3,270 $ 6,883 $ 6,144  
Licensing fee incurred 1,573 340 $ 2,474 630  
Excess expenses percentage for reimbursement of expenses to others by the entity     0.15%    
Expense waiver $ 52,406 $ 39,639 $ 70,199 $ 69,684  
Licensing Agreements          
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS          
Fee percentage     0.015%    
UNL          
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS          
Percentage of contractual obligated to pay     0.75%    
Estimated directors fees and expenses         $ 12,000
Estimated costs         125,000
UNL | Related Public Funds          
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS          
Estimated directors fees and expenses         $ 1,258,000