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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, 2019
Mar. 31, 2018
Dec. 31, 2019
Fees Paid and Related Party Transactions [Line Items]      
USCF Management Fee UNL is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.75% per annum of average daily total net assets.    
Estimated directors fees and expenses $ 328 $ 415  
Licensing fee incurred 182 287  
Expense waiver $ 20,977 $ 17,762  
Licensing Agreements [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Fee percentage 0.015%    
Future Period - for the year ending December 31, 2018 [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated investor tax reporting cost     $ 50,000
Future Period - for the year ending December 31, 2018 [Member] | Maximum [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Costs and expenses annual limit for reimbursement 0.15%    
UNL [Member] | Related Public Funds [Member]      
Fees Paid and Related Party Transactions [Line Items]      
Estimated directors fees and expenses $ 1,500