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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS                      
Estimated directors fees and expenses                 $ 12,755 $ 2,711 $ 1,096
Licensing fee incurred                 1,716 718 651
Expense waiver $ 20,736 $ 38,328 $ 39,639 $ 30,045 $ 12,793 $ 14,037 $ 17,683 $ 16,022 $ 128,748 60,535 74,303
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                 $ 12,755 2,711 1,096
Estimated costs                 114,000    
Investor reporting costs                   62,653 77,834
UNL [Member] | Related Public Funds [Member]                      
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS                      
Estimated directors fees and expenses                 $ 1,081,963 $ 585,896 $ 556,951