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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS                      
Estimated directors fees and expenses                 $ 2,711 $ 1,096 $ 1,447
Licensing fee incurred                 718 651 964
Expense waiver $ 12,793 $ 14,037 $ 17,683 $ 16,022 $ 16,101 $ 16,088 $ 21,137 $ 20,977 $ 60,535 74,303 59,956
Licensing Agreements [Member]                      
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS                      
Fee percentage                 0.015%    
Future Period - for the year ending December 31, 2020 [Member] | Maximum [Member]                      
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS                      
Costs and expenses annual limit for reimbursement                 0.15%    
UNL [Member]                      
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS                      
Percentage of Contractual Obligated to Pay                 0.75%    
Estimated directors fees and expenses                 $ 585,896 1,096 1,447
Estimated investor tax reporting cost                 51,400 77,800 65,000
UNL [Member] | Related Public Funds [Member]                      
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS                      
Estimated directors fees and expenses                 $ 2,711 $ 556,951 $ 521,689