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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 |  |

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- Definition Description of the nature of payments to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP), including the fee rate, basis of calculation, relevant accounting period, whether the fee is paid to an entity other than the managing member or general partner, or whether the fee is waived. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Noninterest expense related to directors' fees which are fees paid by an Entity to its directors. Directors' fees may be paid in addition to salary and other benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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