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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS - (Additional Information) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
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 $ 1,528 $ 746 $ 2,058 $ 1,778
Assets basis for determining fee percentage     on all net assets  
Licensing fee incurred 485 672 $ 936 1,321
Expense waiver (Note 3) $ 24,115 $ 23,928 $ 47,731 $ 41,763
Licensing Agreements [Member]        
Fees Paid and Related Party Transactions [Line Items]        
Fee percentage     0.015%  
Future Period - for the year ending December 31, 2016 [Member]        
Fees Paid and Related Party Transactions [Line Items]        
Estimated investor tax reporting cost     $ 76,000  
Future Period - for the year ending December 31, 2016 [Member] | Maximum [Member]        
Fees Paid and Related Party Transactions [Line Items]        
Costs and expenses annual limit for reimbursement     0.15%  
UNL [Member]        
Fees Paid and Related Party Transactions [Line Items]        
Estimated directors fees and expenses     $ 1,600  
UNL [Member] | Related Public Funds [Member]        
Fees Paid and Related Party Transactions [Line Items]        
Estimated directors fees and expenses     $ 554,800