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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS        
Estimated directors fees and expenses $ 2,874 $ 236    
Licensing fee incurred 290 116    
Expense waiver $ 30,045 $ 16,022    
Maximum [Member]        
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS        
Costs and expenses annual limit for reimbursement 0.15%      
Licensing Agreements [Member]        
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS        
Fee percentage 0.015%      
UNL [Member]        
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS        
Percentage of Contractual Obligated to Pay 0.75%      
Estimated directors fees and expenses       $ 3,000
UNL [Member] | Scenario, Forecast [Member]        
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS        
Estimated investor tax reporting cost     $ 75,000  
UNL [Member] | Related Public Funds [Member]        
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS        
Estimated directors fees and expenses       $ 1,223,400