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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Fees Paid and Related Party Transactions [Line Items]          
Estimated directors fees and expenses $ 271 $ 341 $ 814 $ 1,094  
Licensing fee incurred 152 220 501 741  
Expense waiver $ 16,088 $ 11,999 $ 58,202 $ 45,090  
Licensing Agreements [Member]          
Fees Paid and Related Party Transactions [Line Items]          
Fee percentage     0.015%    
Future Period - for the year ending December 31, 2019 [Member] | Scenario, Forecast [Member]          
Fees Paid and Related Party Transactions [Line Items]          
Estimated investor tax reporting cost         $ 70,000
Future Period - for the year ending December 31, 2019 [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]          
Percentage of Contractual Obligated to Pay     0.75%    
UNL [Member] | Scenario, Forecast [Member]          
Fees Paid and Related Party Transactions [Line Items]          
Estimated directors fees and expenses         1,200
UNL [Member] | Related Public Funds [Member] | Scenario, Forecast [Member]          
Fees Paid and Related Party Transactions [Line Items]          
Estimated directors fees and expenses         $ 543,500