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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, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS              
Estimated directors fees and expenses $ 3,270 $ 151   $ 6,144 $ 387    
Licensing fee incurred 340 132 $ 248 630 248    
Expense waiver $ 39,639 $ 17,683   $ 69,684 $ 33,705    
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           $ 83,000  
UNL [Member] | Related Public Funds [Member]              
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS              
Estimated directors fees and expenses             $ 1,061,000