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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Additional Information) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2017
Fees Paid and Related Party Transactions [Line Items]      
USCF Management Fee UNL is contractually obligated to pay USCF a fee, which is paid monthly, that is equal to 0.75% per annum of average daily total net assets    
Estimated directors fees and expenses $ 438 $ 530  
Assets basis for determining fee percentage on all net assets    
Licensing fee incurred $ 508 451  
Expense waiver (Note 3) $ 15,053 $ 23,616  
Licensing Agreements [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Fee percentage 0.015%    
Future Period - for the year ending December 31, 2017 [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated investor tax reporting cost $ 75,000    
Future Period - for the year ending December 31, 2017 [Member] | Maximum [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Costs and expenses annual limit for reimbursement 0.15%    
UNL [Member] | Scenario, Forecast [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors fees and expenses     $ 1,700
UNL [Member] | Related Public Funds [Member] | Scenario, Forecast [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors fees and expenses     $ 539,350