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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS          
Estimated directors fees and expenses $ 151 $ 215 $ 387 $ 543  
Licensing fee incurred 132 167 248 349  
Expense waiver $ 17,683 $ 21,137 $ 33,705 $ 42,114  
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%    
UNL [Member] | Scenario, Forecast [Member]          
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS          
Estimated directors fees and expenses         $ 2,000
Estimated investor tax reporting cost         65,000
UNL [Member] | Related Public Funds [Member] | Scenario, Forecast [Member]          
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS          
Estimated directors fees and expenses         $ 574,000