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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2020
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS      
Estimated directors fees and expenses $ 236 $ 328  
Licensing fee incurred 116 182  
Expense waiver $ 16,022 $ 20,977  
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     $ 1,000
Estimated investor tax reporting cost     72,000
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