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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2020
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS          
Estimated directors fees and expenses $ 188 $ 271 $ 575 $ 814  
Licensing fee incurred 233 152 481 501  
Expense waiver $ 14,037 $ 16,088 $ 47,742 $ 58,202  
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         60,000
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