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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS            
Estimated directors fees and expenses $ 3,305 $ 188 $ 9,449 $ 575    
Licensing fee incurred 444 233 1,074 481    
Expense waiver $ 38,328 $ 14,037 $ 108,012 $ 47,742    
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           $ 10,000
UNL [Member] | Scenario, Forecast [Member]            
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS            
Estimated investor tax reporting cost         $ 85,000  
UNL [Member] | Related Public Funds [Member]            
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS            
Estimated directors fees and expenses           $ 1,061,000