United States 12 Month Natural Gas Fund (UNL) 10-K20 Mar 202019 FY Annual reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2019	Mar. 18, 2020	Jun. 30, 2019
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	United States 12 Month Natural Gas Fund, LP
Entity Central Index Key	0001405513
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float			$ 4,099,500
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Trading Symbol	UNL
Entity Common Stock, Shares Outstanding		400,000
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false

Statements of Financial Conditi

Statements of Financial Condition - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents (at cost $2,990,732 and $5,167,367, respectively) (Notes 2 and 5)	$ 2,990,732	$ 5,167,367
Equity in trading accounts:
Cash and cash equivalents (at cost $803,973 and $596,555, respectively)	803,973	596,555
Unrealized gain (loss) on open commodity futures contracts	(435,678)	(46,103)
Receivable from General Partner (Note 3)	74,302	59,956
Dividends receivable	658	2,579
Interest receivable	247	289
Prepaid insurance	120	0
Other assets	0	216
Total assets	3,434,354	5,780,859
Liabilities and Partners' Capital
Payable due to Broker	0	81,581
General Partner management fees payable (Note 3)	2,759	3,709
Professional fees payable	57,027	51,486
Brokerage commissions payable	571	571
Directors' fees payable	103	125
Insurance payable	0	516
Total liabilities	60,460	137,988
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital
General Partner	0	0
Limited Partners	3,373,894	5,642,871
Total Partners' Capital	3,373,894	5,642,871
Total liabilities and partners' capital	$ 3,434,354	$ 5,780,859
Limited Partners' shares outstanding	400,000	550,000
Net asset value per share	$ 8.43	$ 10.26
Market value per share	$ 8.39	$ 10.33

Schedule of Investments

Schedule of Investments		Dec. 31, 2019USD ($)contract		Dec. 31, 2018USD ($)contract
Open Futures Contracts Long [Member] \| United States [Member]
Notional Amount		$ 3,812,638	[1]	$ 5,685,063	[2]
Number of Contracts \| contract		145	[1]	201	[2]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (435,678)	[1]	$ (46,103)	[2]
% of Partners' Capital		(12.91%)	[1]	(0.82%)	[2]
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG February 2019 contracts, expiring January 2019
Notional Amount				$ 520,650
Number of Contracts \| contract				16
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ (50,250)
% of Partners' Capital				(0.89%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG March 2019 contracts, expiring February 2019
Notional Amount				$ 520,524
Number of Contracts \| contract				17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ (35,854)
% of Partners' Capital				(0.63%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG April 2019 contracts, expiring March 2019
Notional Amount				$ 462,954
Number of Contracts \| contract				17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ (6,844)
% of Partners' Capital				(0.12%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG May 2019 contracts, expiring April 2019
Notional Amount				$ 450,609
Number of Contracts \| contract				17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ 3,631
% of Partners' Capital				0.07%
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG June 2019 contracts, expiring May 2019
Notional Amount				$ 413,663
Number of Contracts \| contract				16
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ 21,057
% of Partners' Capital				0.37%
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG July 2019 contracts, expiring June 2019
Notional Amount				$ 458,258
Number of Contracts \| contract				17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ 10,942
% of Partners' Capital				0.19%
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG August 2019 contracts, expiring July 2019
Notional Amount				$ 451,616
Number of Contracts \| contract				17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ 17,074
% of Partners' Capital				0.30%
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG September 2019 contracts, expiring August 2019
Notional Amount				$ 462,462
Number of Contracts \| contract				17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ 788
% of Partners' Capital				0.01%
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG October 2019 contracts, expiring September 2019
Notional Amount				$ 427,220
Number of Contracts \| contract				16
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ 13,100
% of Partners' Capital				0.23%
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG November 2019 contracts, expiring October 2019
Notional Amount				$ 480,253
Number of Contracts \| contract				17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ (4,423)
% of Partners' Capital				(0.08%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG December 2019 contracts, expiring November 2019
Notional Amount				$ 501,461
Number of Contracts \| contract				17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ (641)
% of Partners' Capital				(0.01%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG January 2020 contracts, expiring December 2019
Notional Amount				$ 535,393
Number of Contracts \| contract				17
Value/ Unrealized Gain (Loss) on Open Commodity Contracts				$ (14,683)
% of Partners' Capital				(0.26%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG February 2020 contracts, expiring January 2020
Notional Amount		$ 372,317
Number of Contracts \| contract		12
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (109,637)
% of Partners' Capital		(3.25%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG March 2020 contracts, expiring February 2020
Notional Amount		$ 355,883
Number of Contracts \| contract		12
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (96,923)
% of Partners' Capital		(2.87%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG April 2020 contracts, expiring March 2020
Notional Amount		$ 318,189
Number of Contracts \| contract		12
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (60,309)
% of Partners' Capital		(1.79%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG May 2020 contracts, expiring April 2020
Notional Amount		$ 337,171
Number of Contracts \| contract		13
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (52,731)
% of Partners' Capital		(1.56%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG June 2020 contracts, expiring May 2020
Notional Amount		$ 311,571
Number of Contracts \| contract		12
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (42,051)
% of Partners' Capital		(1.25%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG July 2020 contracts, expiring June 2020
Notional Amount		$ 306,018
Number of Contracts \| contract		12
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (29,658)
% of Partners' Capital		(0.88%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG August 2020 contracts, expiring July 2020
Notional Amount		$ 303,009
Number of Contracts \| contract		12
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (24,729)
% of Partners' Capital		(0.73%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG September 2020 contracts, expiring August 2020
Notional Amount		$ 277,911
Number of Contracts \| contract		12
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (591)
% of Partners' Capital		(0.02%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG October 2020 contracts, expiring September 2020
Notional Amount		$ 294,317
Number of Contracts \| contract		12
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (12,797)
% of Partners' Capital		(0.38%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG November 2020 contracts, expiring October 2020
Notional Amount		$ 291,221
Number of Contracts \| contract		12
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ 19
% of Partners' Capital	[3]	0.00%
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG December 2020 contracts, expiring November 2020
Notional Amount		$ 323,237
Number of Contracts \| contract		12
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ (10,877)
% of Partners' Capital		(0.32%)
Open Futures Contracts Long [Member] \| United States [Member] \| NYMEX Natural Gas Futures NG January 2021 contracts, expiring December 2020
Notional Amount		$ 321,794
Number of Contracts \| contract		12
Value/ Unrealized Gain (Loss) on Open Commodity Contracts		$ 4,606
% of Partners' Capital		0.14%
Cash Equivalents [Member]
Market Value		$ 3,289,117		$ 5,577,527
% of Partners' Capital		97.49%		98.84%
Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Market Value		$ 2,789,117		$ 3,977,527
% of Partners' Capital		82.67%		70.49%
Cash Equivalents [Member] \| United States - Money Market Funds [Member]
Market Value		$ 500,000		$ 1,600,000
% of Partners' Capital		14.82%		28.35%
Cash Equivalents [Member] \| United States - Money Market Funds [Member] \| Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]
Principal Amount		$ 400,000		$ 1,500,000
Market Value		$ 400,000		$ 1,500,000
% of Partners' Capital		11.86%		26.58%
Cash Equivalents [Member] \| United States - Money Market Funds [Member] \| Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]
Principal Amount		$ 100,000		$ 100,000
Market Value		$ 100,000		$ 100,000
% of Partners' Capital		2.96%		1.77%
U.S. Treasury Bills: 2.10%, 1/03/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 199,977
% of Partners' Capital				3.54%
U.S. Treasury Bills:2.10%, 1/10/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 199,896
% of Partners' Capital				3.54%
U.S. Treasury Bills:2.13%, 1/17/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 199,812
% of Partners' Capital				3.54%
U.S. Treasury Bills:2.15%, 1/24/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 199,729
% of Partners' Capital				3.54%
U.S. Treasury Bills:2.18%, 1/31/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 199,641
% of Partners' Capital				3.54%
U.S. Treasury Bills:2.20%, 2/07/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 199,553
% of Partners' Capital				3.54%
U.S. Treasury Bills:2.19%, 2/14/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 199,470
% of Partners' Capital				3.54%
U.S. Treasury Bills:2.20%, 2/21/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 199,382
% of Partners' Capital				3.53%
U.S. Treasury Bills:2.24%, 2/28/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 99,643
% of Partners' Capital				1.77%
U.S. Treasury Bills:2.38%, 3/07/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 99,575
% of Partners' Capital				1.77%
U.S. Treasury Bills:2.28%, 3/14/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 99,549
% of Partners' Capital				1.76%
U.S. Treasury Bills:2.33%, 3/21/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 99,495
% of Partners' Capital				1.76%
U.S. Treasury Bills:2.34%, 3/28/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 198,896
% of Partners' Capital				3.53%
U.S. Treasury Bills:2.37%, 4/04/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 99,394
% of Partners' Capital				1.76%
U.S. Treasury Bills:2.41%, 4/11/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 99,338
% of Partners' Capital				1.76%
U.S. Treasury Bills:2.42%, 4/18/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 99,288
% of Partners' Capital				1.76%
U.S. Treasury Bills:2.43%, 4/25/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 99,240
% of Partners' Capital				1.76%
U.S. Treasury Bills:2.46%, 5/02/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 99,185
% of Partners' Capital				1.76%
U.S. Treasury Bills:2.47%, 5/09/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 198,268
% of Partners' Capital				3.51%
U.S. Treasury Bills:2.48%, 5/16/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 99,081
% of Partners' Capital				1.76%
U.S. Treasury Bills:2.50%, 5/23/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 198,055
% of Partners' Capital				3.51%
U.S. Treasury Bills:2.49%, 5/30/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 98,983
% of Partners' Capital				1.75%
U.S. Treasury Bills:2.51%, 6/06/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 197,855
% of Partners' Capital				3.51%
U.S. Treasury Bills:2.51%, 6/13/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 197,754
% of Partners' Capital				3.50%
U.S. Treasury Bills:2.49%, 6/20/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 200,000
Market Value				$ 197,677
% of Partners' Capital				3.50%
U.S. Treasury Bills:2.49%, 6/27/2019 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount				$ 100,000
Market Value				$ 98,791
% of Partners' Capital				1.75%
U.S. Treasury Bills:2.05%, 1/02/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,994
% of Partners' Capital		2.96%
U.S. Treasury Bills:2.03%, 1/09/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 200,000
Market Value		$ 199,911
% of Partners' Capital		5.93%
U.S. Treasury Bills:2.01%, 1/16/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,917
% of Partners' Capital		2.96%
U.S. Treasury Bills:2.04%, 1/23/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,877
% of Partners' Capital		2.96%
U.S. Treasury Bills:2.02%, 1/30/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,839
% of Partners' Capital		2.96%
U.S. Treasury Bills:1.90%, 2/06/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,812
% of Partners' Capital		2.96%
U.S. Treasury Bills:1.87%, 2/13/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,778
% of Partners' Capital		2.96%
U.S. Treasury Bills:1.85%, 2/20/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,745
% of Partners' Capital		2.96%
U.S. Treasury Bills:1.85%, 2/27/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,710
% of Partners' Capital		2.96%
U.S. Treasury Bills:1.83%, 3/05/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 200,000
Market Value		$ 199,354
% of Partners' Capital		5.91%
U.S. Treasury Bills:1.84%, 3/19/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,606
% of Partners' Capital		2.95%
U.S. Treasury Bills:1.88%, 3/26/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 200,000
Market Value		$ 199,122
% of Partners' Capital		5.90%
U.S. Treasury Bills:1.70%, 4/02/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,568
% of Partners' Capital		2.95%
U.S. Treasury Bills:1.64%, 4/09/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,552
% of Partners' Capital		2.95%
U.S. Treasury Bills:1.60%, 4/16/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,532
% of Partners' Capital		2.95%
U.S. Treasury Bills:1.60%, 4/23/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,501
% of Partners' Capital		2.95%
U.S. Treasury Bills:1.59%, 4/30/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,475
% of Partners' Capital		2.95%
U.S. Treasury Bills:1.54%, 5/07/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,462
% of Partners' Capital		2.95%
U.S. Treasury Bills:1.55%, 5/14/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,427
% of Partners' Capital		2.95%
U.S. Treasury Bills:1.55%, 5/21/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,399
% of Partners' Capital		2.95%
U.S. Treasury Bills:1.58%, 5/28/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,354
% of Partners' Capital		2.94%
U.S. Treasury Bills:1.53%, 6/04/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,346
% of Partners' Capital		2.94%
U.S. Treasury Bills:1.53%, 6/11/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,315
% of Partners' Capital		2.94%
U.S. Treasury Bills:1.54%, 6/18/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,284
% of Partners' Capital		2.94%
U.S. Treasury Bills:1.57%, 6/25/2020 [Member] \| Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Principal Amount		$ 100,000
Market Value		$ 99,237
% of Partners' Capital		2.94%

[1]	Collateral amounted to $803,973 on open futures contracts.
[2]	Collateral amounted to $596,555 on open futures contracts.
[3]	Represents less than 0.005%.

Schedule of Investments (Parent

Schedule of Investments (Parenthetical) - USD ($)	12 Months Ended
Schedule of Investments (Parenthetical) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Collateral Amount on Open Futures Contracts	$ 803,973	$ 596,555
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.10%, 1/03/2019 [Member]
Expiration date		1/03/2019
Interest Rate		2.10%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.10%, 1/10/2019 [Member]
Expiration date		1/10/2019
Interest Rate		2.10%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.13%, 1/17/2019 [Member]
Expiration date		1/17/2019
Interest Rate		2.13%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.15%, 1/24/2019 [Member]
Expiration date		1/24/2019
Interest Rate		2.15%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.18%, 1/31/2019 [Member]
Expiration date		1/31/2019
Interest Rate		2.18%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.20%, 2/07/2019 [Member]
Expiration date		2/07/2019
Interest Rate		2.20%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.19%, 2/14/2019 [Member]
Expiration date		2/14/2019
Interest Rate		2.19%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.20%, 2/21/2019 [Member]
Expiration date		2/21/2019
Interest Rate		2.20%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.24%, 2/28/2019 [Member]
Expiration date		2/28/2019
Interest Rate		2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.38%, 3/07/2019 [Member]
Expiration date		3/07/2019
Interest Rate		2.38%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.28%, 3/14/2019 [Member]
Expiration date		3/14/2019
Interest Rate		2.28%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.33%, 3/21/2019 [Member]
Expiration date		3/21/2019
Interest Rate		2.33%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.34%, 3/28/2019 [Member]
Expiration date		3/28/2019
Interest Rate		2.34%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.37%, 4/04/2019 [Member]
Expiration date		4/04/2019
Interest Rate		2.37%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.41%, 4/11/2019 [Member]
Expiration date		4/11/2019
Interest Rate		2.41%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.42%, 4/18/2019 [Member]
Expiration date		4/18/2019
Interest Rate		2.42%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.43%, 4/25/2019 [Member]
Expiration date		4/25/2019
Interest Rate		2.43%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.46%, 5/02/2019 [Member]
Expiration date		5/02/2019
Interest Rate		2.46%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.47%, 5/09/2019 [Member]
Expiration date		5/09/2019
Interest Rate		2.47%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.48%, 5/16/2019 [Member]
Expiration date		5/16/2019
Interest Rate		2.48%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.50%, 5/23/2019 [Member]
Expiration date		5/23/2019
Interest Rate		2.50%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.49%, 5/30/2019 [Member]
Expiration date		5/30/2019
Interest Rate		2.49%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.51%, 6/06/2019 [Member]
Expiration date		6/06/2019
Interest Rate		2.51%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.51%, 6/13/2019 [Member]
Expiration date		6/13/2019
Interest Rate		2.51%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.49%, 6/20/2019 [Member]
Expiration date		6/20/2019
Interest Rate		2.49%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.49%, 6/27/2019 [Member]
Expiration date		6/27/2019
Interest Rate		2.49%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.05%, 1/02/2020 [Member]
Expiration date	1/02/2020
Interest Rate	2.05%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.03%, 1/09/2020 [Member]
Expiration date	1/09/2020
Interest Rate	2.03%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.01%, 1/16/2020 [Member]
Expiration date	1/16/2020
Interest Rate	2.01%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.04%, 1/23/2020 [Member]
Expiration date	1/23/2020
Interest Rate	2.04%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:2.02%, 1/30/2020 [Member]
Expiration date	1/30/2020
Interest Rate	2.02%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:1.90%, 2/06/2020 [Member]
Expiration date	2/06/2020
Interest Rate	1.90%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:1.87%, 2/13/2020 [Member]
Expiration date	2/13/2020
Interest Rate	1.87%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:1.85%, 2/20/2020 [Member]
Expiration date	2/20/2020
Interest Rate	1.85%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:1.85%, 2/27/2020 [Member]
Expiration date	2/27/2020
Interest Rate	1.85%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:1.83%, 3/05/2020 [Member]
Expiration date	3/05/2020
Interest Rate	1.83%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:1.84%, 3/19/2020 [Member]
Expiration date	3/19/2020
Interest Rate	1.84%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:1.88%, 3/26/2020 [Member]
Expiration date	3/26/2020
Interest Rate	1.88%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:1.70%, 4/02/2020 [Member]
Expiration date	4/02/2020
Interest Rate	1.70%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills:1.64%, 4/09/2020 [Member]
Expiration date	4/09/2020
Interest Rate	1.64%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills: 1.60%, 4/16/2020 [Member]
Expiration date	4/16/2020
Interest Rate	1.60%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills: 1.60%, 4/23/2020 [Member]
Expiration date	4/23/2020
Interest Rate	1.60%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills: 1.59%, 4/30/2020 [Member]
Expiration date	4/30/2020
Interest Rate	1.59%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills: 1.54%, 5/07/2020 [Member]
Expiration date	5/07/2020
Interest Rate	1.54%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills: 1.55%, 5/14/2020 [Member]
Expiration date	5/14/2020
Interest Rate	1.55%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills: 1.55%, 5/21/2020 [Member]
Expiration date	5/21/2020
Interest Rate	1.55%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills: 1.58%, 5/28/2020 [Member]
Expiration date	5/28/2020
Interest Rate	1.58%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills: 1.53%, 6/04/2020 [Member]
Expiration date	6/04/2020
Interest Rate	1.53%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills: 1.53%, 6/11/2020 [member]
Expiration date	6/11/2020
Interest Rate	1.53%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills: 1.54%, 6/18/2020 [Member]
Expiration date	6/18/2020
Interest Rate	1.54%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills: 1.57%, 6/25/2020 [Member]
Expiration date	6/25/2020
Interest Rate	1.57%

Statements of Operations

Statements of Operations - USD ($)		12 Months Ended
Statements of Operations - USD ($)		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed futures contracts		$ (479,014)	$ (11,739)	$ 229,715
Change in unrealized gain (loss) on open futures contracts		(389,575)	522,819	(3,364,926)
Dividend income		11,525	24,807	27,445
Interest income*	[1]	81,092	86,283	53,398
ETF transaction fees		700	2,800	2,450
Total income (loss)		(775,272)	624,970	(3,051,918)
Expenses
General Partner management fees (Note 3)		32,545	48,189	78,805
Professional fees		77,834	65,849	71,759
Brokerage commissions		1,231	1,334	2,209
Directors' fees and insurance		1,096	1,447	1,929
License fees		651	964	1,576
Total expenses		113,357	117,783	156,278
Expense waiver (Note 3)		(74,303)	(59,956)	(61,713)
Net expenses		39,054	57,827	94,565
Net income (loss)		$ (814,326)	$ 567,143	$ (3,146,483)
Net income (loss) per limited partnership share		$ (1.83)	$ 1	$ (2.49)
Net income (loss) per weighted average limited partnership share		$ (1.80)	$ 0.84	$ (3.06)
Weighted average limited partnership shares outstanding		452,329	671,507	1,027,534

[1]	Interest income does not exceed paid in kind of 5%.

Statement of Changes in Partner

Statement of Changes in Partners' Capital - USD ($)	General Partner [Member]	Limited Partner [Member]	Total
Balances at Dec. 31, 2016	$ 0	$ 16,445,678	$ 16,445,678
Addition of partnership shares	0	1,021,619	1,021,619
Redemption of partnership shares	0	(5,986,374)	(5,986,374)
Net income (loss)	0	(3,146,483)	(3,146,483)
Balances at Dec. 31, 2017	0	8,334,440	$ 8,334,440
Net asset value, beginning of year at Dec. 31, 2016			$ 11.75
Net asset value, end of year at Dec. 31, 2017			$ 9.26
Addition of partnership shares	0	584,722	$ 584,722
Redemption of partnership shares	0	(3,843,434)	(3,843,434)
Net income (loss)	0	567,143	567,143
Balances at Dec. 31, 2018	0	5,642,871	$ 5,642,871
Net asset value, end of year at Dec. 31, 2018			$ 10.26
Redemption of partnership shares	0	(1,454,651)	$ (1,454,651)
Net income (loss)	0	(814,326)	(814,326)
Balances at Dec. 31, 2019	$ 0	$ 3,373,894	$ 3,373,894
Net asset value, end of year at Dec. 31, 2019			$ 8.43

Statement of Changes in Partn_2

Statement of Changes in Partners' Capital (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Changes in Partners' Capital
Addition of partnership share		50,000	100,000
Redemption of partnership shares	150,000	400,000	600,000

Statements of Cash Flows

Statements of Cash Flows - USD ($)	12 Months Ended
Statements of Cash Flows - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net income (loss)	$ (814,326)	$ 567,143	$ (3,146,483)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts	389,575	(522,819)	3,364,926
(Increase) decrease in receivable from General Partner	(14,346)	1,757	40,379
(Increase) decrease in dividends receivable	1,921	(260)	(831)
(Increase) decrease in interest receivable	42	(201)	(88)
(Increase) decrease in prepaid insurance	(120)	253	(107)
(Increase) decrease in ETF transaction fees receivable	0	0	350
(Increase) decrease in other assets	216	(216)	0
Increase (decrease) in payable due to Broker	(81,581)	81,581	(2,099,689)
Increase (decrease) in General Partner management fees payable	(950)	(1,784)	(4,944)
Increase (decrease) in professional fees payable	5,541	(21,209)	(29,606)
Increase (decrease) in brokerage commissions payable	0	(610)	(620)
Increase (decrease) in directors' fees payable	(22)	(62)	(65)
Increase (decrease) in insurance payable	(516)	516
Increase (decrease) in license fees payable		(331)	(413)
Net cash provided by (used in) operating activities	(514,566)	103,758	(1,877,191)
Cash Flows from Financing Activities:
Addition of partnership shares		584,722	1,021,619
Redemption of partnership shares	(1,454,651)	(3,843,434)	(5,986,374)
Net cash provided by (used in) financing activities	(1,454,651)	(3,258,712)	(4,964,755)
Net Increase (Decrease) in Cash and Cash Equivalents	(1,969,217)	(3,154,954)	(6,841,946)
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year	5,763,922	8,918,876	15,760,822
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year	$ 3,794,705	$ 5,763,922	$ 8,918,876

Statements of Cash Flows (Paren

Statements of Cash Flows (Parenthetical) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents	$ 2,990,732	$ 5,167,367	$ 7,217,601
Equity in Trading Accounts:
Cash and Cash Equivalents	803,973	596,555	1,701,275
Total Cash, Cash Equivalents and Equity in Trading Accounts	$ 3,794,705	$ 5,763,922	$ 8,918,876

ORGANIZATION AND BUSINESS

ORGANIZATION AND BUSINESS	12 Months Ended
ORGANIZATION AND BUSINESS	Dec. 31, 2019
ORGANIZATION AND BUSINESS
ORGANIZATION AND BUSINESS	United States 12 Month Natural Gas Fund, LP Notes to Financial Statements For the years ended December 31, 2019, 2018 and 2017 NOTE 1 — ORGANIZATION AND BUSINESS The United States 12 Month Natural Gas Fund, LP (“UNL”) was organized as a limited partnership under the laws of the state of Delaware on June 27, 2007. UNL is a commodity pool that issues limited partnership shares (“shares”) that may be purchased and sold on the NYSE Arca, Inc. (the “NYSE Arca”). UNL will continue in perpetuity, unless terminated sooner upon the occurrence of one or more events as described in its Third Amended and Restated Agreement of Limited Partnership dated as of December 15, 2017 (the “LP Agreement”). The investment objective of UNL is for the daily changes in percentage terms of its shares’ per share net asset value (“NAV”) to reflect the daily changes in percentage terms of the spot price of natural gas delivered at the Henry Hub, Louisiana, as measured by the daily changes in the average of the prices of 12 futures contracts for natural gas traded on the New York Mercantile Exchange (the “NYMEX”), consisting of the near month contract to expire and the contracts for the following 11 months for a total of 12 consecutive months’ contracts, except when the near month contract is within two weeks of expiration, in which case it will be measured by the futures contracts that is the next month contract to expire and the contracts for the following 11 consecutive months (the “Benchmark Futures Contracts”), plus interest earned on UNL’s collateral holdings, less UNL’s expenses. UNL’s investment objective is not for its NAV or market price of shares to equal, in dollar terms, the spot price of natural gas or any particular futures contract based on natural gas, nor is UNL’s investment objective for the percentage change in its NAV to reflect the percentage change of the price of any particular futures contract as measured over a time period greater than one day . United States Commodity Funds LLC (“USCF”), the general partner of UNL, believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in Futures Contracts (as defined below) and Other Natural Gas-Related Investments (as defined below). UNL accomplishes its objective through investments in futures contracts for natural gas, crude oil, diesel-heating oil, gasoline and other petroleum-based fuels that are traded on the NYMEX, ICE Futures or other U.S. and foreign exchanges (collectively, “Futures Contracts”) and other natural gas-related investments such as cash-settled options on Futures Contracts, forward contracts for natural gas, cleared swap contracts and over-the-counter (“OTC”) transactions that are based on the price of natural gas, crude oil and other petroleum-based fuels, Futures Contracts and indices based on the foregoing (collectively, “Other Natural Gas-Related Investments”). As of December 31, 2019, UNL held 145 Futures Contracts for natural gas traded on the NYMEX and did not hold any Futures Contracts traded on ICE Futures US. UNL commenced investment operations on November 18, 2009 and has a fiscal year ending on December 31. USCF is responsible for the management of UNL. USCF is a member of the National Futures Association (the “NFA”) and became registered as a commodity pool operator with the Commodity Futures Trading Commission (the “CFTC”) effective December 1, 2005 and a swaps firm on August 8, 2013. USCF is also the general partner of the United States Oil Fund, LP (“USO”), the United States Natural Gas Fund, LP (“UNG”), the United States 12 Month Oil Fund, LP (“USL”) and the United States Gasoline Fund, LP (“UGA”), which listed their limited partnership shares on the American Stock Exchange (the “AMEX”) under the ticker symbols “USO” on April 10, 2006, “UNG” on April 18, 2007, “USL” on December 6, 2007 and “UGA” on February 26, 2008, respectively. As a result of the acquisition of the AMEX by NYSE Euronext, each of USO’s, UNG’s, USL’s and UGA’s shares commenced trading on the NYSE Arca on November 25, 2008. USCF is also the general partner of the United States Brent Oil Fund, LP (“BNO”), which listed their limited partnership shares on the NYSE Arca under the ticker symbols “BNO” on June 2, 2010. USCF previously served as the general partner for the United States Short Oil Fund, LP (“DNO”) and the United States Diesel-Heating Oil Fund, LP (“UHN”), both of which were liquidated in 2018. USCF is also the sponsor of the United States Commodity Index Fund (“USCI”), the United States Copper Index Fund (“CPER”) and the USCF Crescent Crypto Index Fund (“XBET”), each a series of the United States Commodity Index Funds Trust (“USCIFT”). USCF previously served as the sponsor for the United States Agricultural Index Fund (“USAG”) a series of USCIFT which was liquidated in 2018. XBET is currently in registration and has not commenced operations. USCI and CPER listed their shares on the NYSE Arca under the ticker symbols “USCI” on August 10, 2010 and “CPER” on November 15, 2011, respectively. In addition, USCF is the sponsor of the USCF Funds Trust, a Delaware statutory trust, and each of its series, the United States 3x Oil Fund (“USOU”) and the United States 3x Short Oil Fund (“USOD”), which listed their shares on the NYSE Arca on July 20, 2017 under the ticker symbols “USOU” and “USOD”, respectively. Each of USOU and USOD liquidated all of its assets and distributed cash pro rata to all remaining shareholders in December 2019. USO, UNG, UGA, UNL, USL, BNO, USCI and CPER are referred to collectively herein as the “Related Public Funds.” UNL issues shares to certain authorized purchasers (“Authorized Participants”) by offering baskets consisting of 50,000 shares (“Creation Baskets”) through ALPS Distributors, Inc., as the marketing agent (the “Marketing Agent”). The purchase price for a Creation Basket is based upon the NAV of a share calculated shortly after the close of the core trading session on the NYSE Arca on the day the order to create the basket is properly received. Authorized Participants pay UNL a $350 transaction fee for each order placed to create one or more Creation Baskets or to redeem one or more baskets (“Redemption Baskets”), consisting of 50,000 shares. Shares may be purchased or sold on a nationally recognized securities exchange in smaller increments than a Creation Basket or Redemption Basket. Shares purchased or sold on a nationally recognized securities exchange are not purchased or sold at the per share NAV of UNL but rather at market prices quoted on such exchange. In November 2009, UNL initially registered 30,000,000 shares on Form S‑1 with the U.S. Securities and Exchange Commission (the “SEC”). On November 18, 2009, UNL listed its shares on the NYSE Arca under the ticker symbol “UNL”. On that day, UNL established its initial per share NAV by setting the price at $50.00 and issued 200,000 shares in exchange for $10,000,000. UNL also commenced investment operations on November 18, 2009, by purchasing Futures Contracts traded on the NYMEX based on natural gas. As of December 31, 2019, UNL had registered a total of 30,000,000 shares.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	NOTE 2 — SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") as detailed in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification. UNL is an investment company and follows the accounting and reporting guidance in FASB Topic 946. Revenue Recognition Commodity futures contracts, forward contracts, physical commodities and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the financial statements. Changes in the unrealized gains or losses between periods are reflected in the statements of operations. UNL earns income on funds held at the custodian or a futures commission merchant (“FCM”) at prevailing market rates earned on such investments. Brokerage Commissions Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis. Income Taxes UNL is not subject to federal income taxes; each partner reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return. In accordance with U.S. GAAP, UNL is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. UNL files an income tax return in the U.S. federal jurisdiction and may file income tax returns in various U.S. states. UNL is not subject to income tax return examinations by major taxing authorities for years before 2016. The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in UNL recording a tax liability that reduces net assets. However, UNL’s conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. UNL recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the year ended December 31, 2019. Creations and Redemptions Authorized Participants may purchase Creation Baskets or redeem Redemption Baskets only in blocks of 50,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed. UNL receives or pays the proceeds from shares sold or redeemed within two business days after the trade date of the purchase or redemption. The amounts due from Authorized Participants are reflected in UNL’s statements of financial condition as receivable for shares sold and amounts payable to Authorized Participants upon redemption are reflected as payable for shares redeemed. Authorized Participants pay UNL a $350 transaction fee for each order placed to create one or more Creation Baskets or to redeem one or more Redemption Baskets. Partnership Capital and Allocation of Partnership Income and Losses Profit or loss shall be allocated among the partners of UNL in proportion to the number of shares each partner holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the LP Agreement . Calculation of Per Share NAV UNL’s per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing that amount by the total number of shares outstanding. UNL uses the closing price for the contracts on the relevant exchange on that day to determine the value of contracts held on such exchange. Net Income (Loss) Per Share Net income (loss) per share is the difference between the per share NAV at the beginning of each period and at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. There were no shares held by USCF at December 31, 2019. Offering Costs Offering costs incurred in connection with the registration of additional shares after the initial registration of shares are borne by UNL. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. These costs are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted. Cash Equivalents Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of six months or less. Reclassification Certain amounts in the accompanying financial statements were reclassified to conform to the current presentation. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

FEES PAID BY THE FUND AND RELAT

FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS	12 Months Ended
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS	Dec. 31, 2019
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS	NOTE 3 — FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS USCF Management Fee Under the LP Agreement, USCF is responsible for investing the assets of UNL in accordance with the objectives and policies of UNL. In addition, USCF has arranged for one or more third parties to provide administrative, custody, accounting, transfer agency and other necessary services to UNL. For these services, 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. Ongoing Registration Fees and Other Offering Expenses UNL pays all costs and expenses associated with the ongoing registration of its shares subsequent to the initial offering. These costs include registration or other fees paid to regulatory agencies in connection with the offer and sale of shares, and all legal, accounting, printing and other expenses associated with such offer and sale. For the years ended December 31, 2019, 2018 and 2017, UNL did not incur registration fees and other offering expenses. Independent Directors’ and Officers’ Expenses UNL is responsible for paying its portion of the directors’ and officers’ liability insurance for UNL and the Related Public Funds and the fees and expenses of the independent directors who also serve as audit committee members of UNL and the Related Public Funds. UNL shares the fees and expenses on a pro rata basis with each Related Public Fund, as described above, based on the relative assets of each Related Public Fund computed on a daily basis. These fees and expenses for the year ended December 31, 2019 were $556,951 for UNL and the Related Public Funds. UNL’s portion of such fees and expenses for the year ended December 31, 2019 was $1,096. For the year ended December 31, 2018, these fees and expenses were $521,689 for UNL and the Related Public Funds. UNL’s portion of such fees and expenses for the year ended December 31, 2018 was $1,447. For the year ended December 31, 2017, these fees and expenses were $536,375 for UNL and the Related Public Funds. UNL’s portion of such fees and expenses for the year ended December 31, 2017 was $1,929. Licensing Fees As discussed in Note 4 below, UNL entered into a licensing agreement with the NYMEX on December 4, 2007, as amended on October 20, 2011. Pursuant to the agreement, UNL and the Related Public Funds, other than BNO, USCI and CPER, pay a licensing fee that is equal to 0.015% on all net assets. During the years ended December 31, 2019, 2018 and 2017, UNL incurred $651, $964 and $1,576, respectively, under this arrangement. Investor Tax Reporting Cost The fees and expenses associated with UNL’s audit expenses and tax accounting and reporting requirements are paid by UNL. These costs were approximately $77,834 for the year ended December 31, 2019, approximately $65,000 for the year ended December 31, 2018 and approximately $72,000 for the year ended December 31, 2017. Tax reporting costs fluctuate between years due to the number of shareholders during any given year. Other Expenses and Fees and Expense Waivers In addition to the fees described above, UNL pays all brokerage fees and other expenses in connection with the operation of UNL, excluding costs and expenses paid by USCF as outlined in Note 4 – Contracts and Agreements below. USCF paid certain expenses on a discretionary basis typically borne by UNL, where expenses exceed 0.15% (15 basis points) of UNL’s NAV, on an annualized basis. USCF has no obligation to continue such payments into subsequent periods. For the year ended December 31, 2019, USCF waived $74,303 of UNL’s expenses. This voluntary expense waiver is in addition to those amounts USCF is contractually obligated to pay as described in Note 4 – Contracts and Agreements .

CONTRACTS AND AGREEMENTS

CONTRACTS AND AGREEMENTS	12 Months Ended
CONTRACTS AND AGREEMENTS	Dec. 31, 2019
CONTRACTS AND AGREEMENTS
CONTRACTS AND AGREEMENTS	NOTE 4 — CONTRACTS AND AGREEMENTS Marketing Agent Agreement UNL is party to a marketing agent agreement, dated as of October 30, 2009, as amended from time to time, with the Marketing Agent and USCF, whereby the Marketing Agent provides certain marketing services for UNL as outlined in the agreement. The fee of the Marketing Agent, which is borne by USCF, is equal to 0.06% on UNL’s assets up to $3 billion and 0.04% on UNL’s assets in excess of $3 billion. In no event may the aggregate compensation paid to the Marketing Agent and any affiliate of USCF for distribution-related services exceed 10% of the gross proceeds of UNL’s offering. The above fee does not include website construction and development, which are also borne by USCF. Brown Brothers Harriman & Co. Agreements UNL is also party to a custodian agreement, dated November 3, 2009, as amended from time to time, with Brown Brothers Harriman & Co. (“BBH&Co.”) and USCF, whereby BBH&Co. holds investments on behalf of UNL. USCF pays the fees of the custodian, which are determined by the parties from time to time. In addition, UNL is party to an administrative agency agreement, dated November 3, 2009, as amended from time to time, with USCF and BBH&Co., whereby BBH&Co. acts as the administrative agent, transfer agent and registrar for UNL. USCF also pays the fees of BBH&Co. for its services under such agreement and such fees are determined by the parties from time to time. Currently, USCF pays BBH&Co. for its services, in the foregoing capacities, a minimum amount of $75,000 annually for its custody, fund accounting and fund administration services rendered to UNL and each of the Related Public Funds, as well as a $20,000 annual fee for its transfer agency services. In addition, USCF pays BBH&Co. an asset-based charge of (a) 0.06% for the first $500 million of the Related Public Funds’ combined net assets, (b) 0.0465% for the Related Public Funds’ combined net assets greater than $500 million but less than $1 billion, and (c) 0.035% once the Related Public Funds’ combined net assets exceed $1 billion. The annual minimum amount will not apply if the asset-based charge for all accounts in the aggregate exceeds $75,000. USCF also pays BBH&Co. transaction fees ranging from $7 to $15 per transaction. Brokerage and Futures Commission Merchant Agreements On October 8, 2013, UNL entered into a brokerage agreement with RBC to serve as UNL’s FCM effective October 10, 2013. The agreement with RBC requires it to provide services to UNL in connection with the purchase and sale of Futures Contracts and Other Natural Gas-Related Investments that may be purchased and sold by or through RBC for UNL’s account. In accordance with the agreement, RBC charges UNL commissions of approximately $7 to $8 per round-turn trade, including applicable exchange, clearing and NFA fees for Futures Contracts and options on Futures Contracts. Such fees include those incurred when purchasing Futures Contracts and options on Futures Contracts when UNL issues shares as a result of a Creation Basket, as well as fees incurred when selling Futures Contracts and options on Futures Contracts when UNL redeems shares as a result of a Redemption Basket. Such fees are also incurred when Futures Contracts and options on Futures Contracts are purchased or redeemed for the purpose of rebalancing the portfolio. UNL also incurs commissions to brokers for the purchase and sale of Futures Contracts, Other Natural Gas-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”). For the Year Ended For the Year Ended For the Year Ended December 31, 2019 December 31, 2018 December 31, 2017 Total commissions accrued to brokers $ 1,231 $ 1,334 $ 2,209 Total commissions as annualized percentage of average total net assets 0.03 % 0.02 % 0.02 % Commissions accrued as a result of rebalancing $ 1,084 $ 823 $ 1,605 Percentage of commissions accrued as a result of rebalancing 88.06 % 61.69 % 72.66 % Commissions accrued as a result of creation and redemption activity $ 147 $ 511 $ 604 Percentage of commissions accrued as a result of creation and redemption activity 11.94 % 38.31 % 27.34 % The decrease in total commissions accrued to brokers for the year ended December 31, 2019, compared to the year ended December 31, 2018, was due primarily to a lower number of natural gas futures contracts being held and traded. The decrease in total commissions accrued to brokers for the year ended December 31, 2018, compared to the year ended December 31, 2017, was due primarily to lower number of futures contracts being held and traded. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters. NYMEX Licensing Agreement UNL and the NYMEX entered into a licensing agreement on December 4, 2007, as amended on October 20, 2011, whereby UNL was granted a non-exclusive license to use certain of the NYMEX’s settlement prices and service marks. Under the licensing agreement, UNL and the Related Public Funds, other than BNO, USCI, CPER, USOU and USOD, pay the NYMEX an asset-based fee for the license, the terms of which are described in Note 3. UNL expressly disclaims any association with the NYMEX or endorsement of UNL by the NYMEX and acknowledges that “NYMEX” and “New York Mercantile Exchange” are registered trademarks of the NYMEX.

FINANCIAL INSTRUMENTS, OFF-BALA

FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2019
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES	NOTE 5 — FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES UNL may engage in the trading of futures contracts, options on futures contracts, cleared swaps and OTC swaps (collectively, “derivatives”). UNL is exposed to both market risk, which is the risk arising from changes in the market value of the contracts, and credit risk, which is the risk of failure by another party to perform according to the terms of a contract. UNL may enter into futures contracts, options on futures contracts and cleared swaps to gain exposure to changes in the value of an underlying commodity. A futures contract obligates the seller to deliver (and the purchaser to accept) the future delivery of a specified quantity and type of a commodity at a specified time and place. Some futures contracts may call for physical delivery of the asset, while others are settled in cash. The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity or by making an offsetting sale or purchase of an identical futures contract on the same or linked exchange before the designated date of delivery. Cleared swaps are agreements that are eligible to be cleared by a clearinghouse, e.g., ICE Clear Europe, and provide the efficiencies and benefits that centralized clearing on an exchange offers to traders of futures contracts, including credit risk intermediation and the ability to offset positions initiated with different counterparties. The purchase and sale of futures contracts, options on futures contracts and cleared swaps require margin deposits with an FCM. Additional deposits may be necessary for any loss on contract value. The Commodity Exchange Act requires an FCM to segregate all customer transactions and assets from the FCM’s proprietary activities. Futures contracts, options on futures contracts and cleared swaps involve, to varying degrees, elements of market risk (specifically commodity price risk) and exposure to loss in excess of the amount of variation margin. The face or contract amounts reflect the extent of the total exposure UNL has in the particular classes of instruments. Additional risks associated with the use of futures contracts are an imperfect correlation between movements in the price of the futures contracts and the market value of the underlying securities and the possibility of an illiquid market for a futures contract. Buying and selling options on futures contracts exposes investors to the risks of purchasing or selling futures contracts. All of the futures contracts held by UNL through December 31, 2019 were exchange-traded. The risks associated with exchange-traded contracts are generally perceived to be less than those associated with OTC swaps since, in OTC swaps, a party must rely solely on the credit of its respective individual counterparties. However, in the future, if UNL were to enter into non-exchange traded contracts, it would be subject to the credit risk associated with counterparty non-performance. The credit risk from counterparty non-performance associated with such instruments is the net unrealized gain, if any, on the transaction. UNL has credit risk under its futures contracts since the sole counterparty to all domestic and foreign futures contracts is the clearinghouse for the exchange on which the relevant contracts are traded. In addition, UNL bears the risk of financial failure by the clearing broker. UNL’s cash and other property, such as Treasuries, deposited with an FCM are considered commingled with all other customer funds, subject to the FCM’s segregation requirements. In the event of an FCM’s insolvency, recovery may be limited to a pro rata share of segregated funds available. It is possible that the recovered amount could be less than the total of cash and other property deposited. The insolvency of an FCM could result in the complete loss of UNL’s assets posted with that FCM; however, the majority of UNL’s assets are held in investments in Treasuries, cash and/or cash equivalents with UNL’s custodian and would not be impacted by the insolvency of an FCM. The failure or insolvency of UNL’s custodian, however, could result in a substantial loss of UNL’s assets. USCF invests a portion of UNL’s cash in money market funds that seek to maintain a stable per share NAV. UNL is exposed to any risk of loss associated with an investment in such money market funds. As of December 31, 2019 and December 31, 2018, UNL held investments in money market funds in the amounts of $500,000 and $1,600,000, respectively. UNL also holds cash deposits with its custodian. Pursuant to a written agreement with BBH&Co., uninvested overnight cash balances are swept to offshore branches of U.S. regulated and domiciled banks located in Toronto, Canada; London, United Kingdom; Grand Cayman, Cayman Islands; and Nassau, Bahamas; which are subject to U.S. regulation and regulatory oversight. As of December 31, 2019 and December 31, 2018, UNL held cash deposits and investments in Treasuries in the amounts of $3,294,705 and $4,163,922, respectively, with the custodian and FCM. Some or all of these amounts may be subject to loss should UNL’s custodian and/or FCM cease operations. For derivatives, risks arise from changes in the market value of the contracts. Theoretically, UNL is exposed to market risk equal to the value of futures contracts purchased and unlimited liability on such contracts sold short. As both a buyer and a seller of options, UNL pays or receives a premium at the outset and then bears the risk of unfavorable changes in the price of the contract underlying the option. UNL’s policy is to continuously monitor its exposure to market and counterparty risk through the use of a variety of financial, position and credit exposure reporting controls and procedures. In addition, UNL has a policy of requiring review of the credit standing of each broker or counterparty with which it conducts business. The financial instruments held by UNL are reported in its statements of financial condition at market or fair value, or at carrying amounts that approximate fair value, because of their highly liquid nature and short-term maturity.

FINANCIAL HIGHLIGHTS

FINANCIAL HIGHLIGHTS	12 Months Ended
FINANCIAL HIGHLIGHTS	Dec. 31, 2019
FINANCIAL HIGHLIGHTS
FINANCIAL HIGHLIGHTS	NOTE 6 — FINANCIAL HIGHLIGHTS The following table presents per share performance data and other supplemental financial data for the years ended December 31, 2019, 2018 and 2017 for the shareholders. This information has been derived from information presented in the financial statements. Year ended December Year ended December Year ended December 31, 2019 31, 2018 31, 2017 Per Share Operating Performance: Net asset value, beginning of year $ 10.26 $ 9.26 $ 11.75 Total income (loss) (1.74) 1.09 (2.40) Net expenses (0.09) (0.09) (0.09) Net increase (decrease) in net asset value (1.83) 1.00 (2.49) Net asset value, end of year $ 8.43 $ 10.26 $ 9.26 Total Return (17.84) % 10.80 % (21.19) % Ratios to Average Net Assets Total income (loss) (17.87) % 9.73 % (29.05) % Management fees 0.75 % 0.75 % 0.75 % Total expenses excluding management fees 1.86 % 1.08 % 0.74 % Expenses waived (1.71) % (0.93) % (0.59) % Net expenses excluding management fees 0.15 % 0.15 % 0.15 % Net income (loss) (18.77) % 8.83 % (29.95) % Total returns are calculated based on the change in value during the period. An individual shareholder’s total return and ratio may vary from the above total returns and ratios based on the timing of contributions to and withdrawals from UNL.

QUARTERLY FINANCIAL DATA (Unaud

QUARTERLY FINANCIAL DATA (Unaudited)	12 Months Ended
QUARTERLY FINANCIAL DATA (Unaudited)	Dec. 31, 2019
QUARTERLY FINANCIAL DATA (Unaudited)
QUARTERLY FINANCIAL DATA (Unaudited)	NOTE 7 — QUARTERLY FINANCIAL DATA (Unaudited) The following summarized (unaudited) quarterly financial information presents the results of operations and other data for the three-month periods ended March 31, June 30, September 30 and December 31, 2019 and 2018. First Second Third Fourth Quarter Quarter Quarter Quarter 2019 2019 2019 2019 Total Income (Loss) $ 123,909 $ (614,755) $ (111,493) $ (172,933) Total Expenses 31,893 31,133 25,256 25,075 Expense Waivers (20,977) (21,137) (16,088) (16,101) Net Expenses 10,916 9,996 9,168 8,974 Net Income (Loss) $ 112,993 $ (624,751) $ (120,661) $ (181,907) Net Income (Loss) per Share $ 0.24 $ (1.39) $ (0.27) $ (0.41) First Second Third Fourth Quarter Quarter Quarter Quarter 2018 2018 2018 2018 Total Income (Loss) $ 68,119 $ 144,125 $ (21,437) $ 434,163 Total Expenses 35,055 29,326 25,180 28,222 Expense Waivers (17,762) (15,329) (11,999) (14,866) Net Expenses 17,293 13,997 13,181 13,356 Net Income (Loss) $ 50,826 $ 130,128 $ (34,618) $ 420,807 Net Income (Loss) per Share $ 0.03 $ 0.20 $ (0.04) $ 0.81

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS	12 Months Ended
FAIR VALUE OF FINANCIAL INSTRUMENTS	Dec. 31, 2019
FAIR VALUE OF FINANCIAL INSTRUMENTS
FAIR VALUE OF FINANCIAL INSTRUMENTS	NOTE 8 — FAIR VALUE OF FINANCIAL INSTRUMENTS UNL values its investments in accordance with Accounting Standards Codification 820 – Fair Value Measurements and Disclosures (“ASC 820”). ASC 820 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurement. The changes to past practice resulting from the application of ASC 820 relate to the definition of fair value, the methods used to measure fair value, and the expanded disclosures about fair value measurement. ASC 820 establishes a fair value hierarchy that distinguishes between: (1) market participant assumptions developed based on market data obtained from sources independent of UNL (observable inputs) and (2) UNL’s own assumptions about market participant assumptions developed based on the best information available under the circumstances (unobservable inputs). The three levels defined by the ASC 820 hierarchy are as follows: Level I – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level II – Inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. Level II assets include the following: quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market-corroborated inputs). Level III – Unobservable pricing input at the measurement date for the asset or liability. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available. In some instances, the inputs used to measure fair value might fall within different levels of the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement in its entirety falls shall be determined based on the lowest input level that is significant to the fair value measurement in its entirety. The following table summarizes the valuation of UNL’s securities at December 31, 2019 using the fair value hierarchy: At December 31, 2019 Total Level I Level II Level III Short-Term Investments $ 3,289,117 $ 3,289,117 $ — $ — Exchange-Traded Futures Contracts United States Contracts (435,678) (435,678) — — During the year ended December 31, 2019, there were no transfers between Level I and Level II. The following table summarizes the valuation of UNL’s securities at December 31, 2018 using the fair value hierarchy: At December 31, 2018 Total Level I Level II Level III Short-Term Investments $ 5,577,527 $ 5,577,527 $ — $ — Exchange-Traded Futures Contracts United States Contracts (46,103) (46,103) — — During the year ended December 31, 2018, there were no transfers between Level I and Level II. Effective January 1, 2009, UNL adopted the provisions of Accounting Standards Codification 815 — Derivatives and Hedging, which require presentation of qualitative disclosures about objectives and strategies for using derivatives, quantitative disclosures about fair value amounts and gains and losses on derivatives. Fair Value of Derivative Instruments Derivatives not Accounted for Fair Value Fair Value as Hedging Statements of Financial At December 31, At December 31, Instruments Condition Location 2019 2018 Futures - Commodity Contracts Assets $ (435,678) $ (46,103) The Effect of Derivative Instruments on the Statements of Operations For the year ended For the year ended For the year ended December 31, 2019 December 31, 2018 December 31, 2017 Change in Change in Change in Derivatives Location of Realized Unrealized Realized Unrealized Realized Unrealized not Accounted Gain (Loss) Gain (Loss) Gain (Loss) on Gain (Loss) Gain (Loss) on Gain (Loss) Gain (Loss) on for as on Derivatives on Derivatives Derivatives on Derivatives Derivatives on Derivatives Derivatives Hedging Recognized in Recognized in Recognized in Recognized in Recognized in Recognized in Recognized in Instruments Income Income Income Income Income Income Income Futures - Commodity Contracts Realized gain (loss) on closed positions $ (479,014) $ (11,739) $ 229,715 Change in unrealized gain (loss) on open positions $ (389,575) $ 522,819 $ (3,364,926)

RECENT ACCOUNTING PRONOUNCEMENT

RECENT ACCOUNTING PRONOUNCEMENTS	12 Months Ended
RECENT ACCOUNTING PRONOUNCEMENTS	Dec. 31, 2019
RECENT ACCOUNTING PRONOUNCEMENTS
RECENT ACCOUNTING PRONOUNCEMENTS	NOTE 9 — RECENT ACCOUNTING PRONOUNCEMENTS In August 2018, the FASB issued Accounting Standards Update (“ASU”) No. 2018-13, which changes certain fair value measurement disclosure requirements. The new ASU, in addition to other modifications and additions, removes the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, and the Funds’ policy for the timing of transfers between levels. The amendments are effective for financial statements issued for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. The Fund has evaluated the implications of certain provisions of the ASU and has determined that there will be no material impacts to the financial statements.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2019
SUBSEQUENT EVENTS
SUBSEQUENT EVENTS	NOTE 10 — SUBSEQUENT EVENTS UNL has performed an evaluation of subsequent events through the date the financial statements were issued. This evaluation did not result in any subsequent events that necessitated disclosures and/or adjustments.

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Basis of Presentation	Basis of Presentation The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") as detailed in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification. UNL is an investment company and follows the accounting and reporting guidance in FASB Topic 946.
Revenue Recognition	Revenue Recognition Commodity futures contracts, forward contracts, physical commodities and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the financial statements. Changes in the unrealized gains or losses between periods are reflected in the statements of operations. UNL earns income on funds held at the custodian or a futures commission merchant (“FCM”) at prevailing market rates earned on such investments.
Brokerage Commissions	Brokerage Commissions Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.
Income Taxes	Income Taxes UNL is not subject to federal income taxes; each partner reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return. In accordance with U.S. GAAP, UNL is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. UNL files an income tax return in the U.S. federal jurisdiction and may file income tax returns in various U.S. states. UNL is not subject to income tax return examinations by major taxing authorities for years before 2016. The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in UNL recording a tax liability that reduces net assets. However, UNL’s conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. UNL recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the year ended December 31, 2019.
Creations and Redemptions	Creations and Redemptions Authorized Participants may purchase Creation Baskets or redeem Redemption Baskets only in blocks of 50,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed. UNL receives or pays the proceeds from shares sold or redeemed within two business days after the trade date of the purchase or redemption. The amounts due from Authorized Participants are reflected in UNL’s statements of financial condition as receivable for shares sold and amounts payable to Authorized Participants upon redemption are reflected as payable for shares redeemed. Authorized Participants pay UNL a $350 transaction fee for each order placed to create one or more Creation Baskets or to redeem one or more Redemption Baskets.
Partnership Capital and Allocation of Partnership Income and Losses	Partnership Capital and Allocation of Partnership Income and Losses Profit or loss shall be allocated among the partners of UNL in proportion to the number of shares each partner holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the LP Agreement .
Calculation of Per Share NAV	Calculation of Per Share NAV UNL’s per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing that amount by the total number of shares outstanding. UNL uses the closing price for the contracts on the relevant exchange on that day to determine the value of contracts held on such exchange.
Net Income (Loss) Per Share	Net Income (Loss) Per Share Net income (loss) per share is the difference between the per share NAV at the beginning of each period and at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. There were no shares held by USCF at December 31, 2019.
Offering Costs	Offering Costs Offering costs incurred in connection with the registration of additional shares after the initial registration of shares are borne by UNL. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. These costs are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.
Cash Equivalents	Cash Equivalents Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of six months or less.
Reclassification	Reclassification Certain amounts in the accompanying financial statements were reclassified to conform to the current presentation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

CONTRACTS AND AGREEMENTS (Table

CONTRACTS AND AGREEMENTS (Tables)	12 Months Ended
CONTRACTS AND AGREEMENTS (Tables)	Dec. 31, 2019
CONTRACTS AND AGREEMENTS
Schedule of Brokerage and Futures Commissions	UNL also incurs commissions to brokers for the purchase and sale of Futures Contracts, Other Natural Gas-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”). For the Year Ended For the Year Ended For the Year Ended December 31, 2019 December 31, 2018 December 31, 2017 Total commissions accrued to brokers $ 1,231 $ 1,334 $ 2,209 Total commissions as annualized percentage of average total net assets 0.03 % 0.02 % 0.02 % Commissions accrued as a result of rebalancing $ 1,084 $ 823 $ 1,605 Percentage of commissions accrued as a result of rebalancing 88.06 % 61.69 % 72.66 % Commissions accrued as a result of creation and redemption activity $ 147 $ 511 $ 604 Percentage of commissions accrued as a result of creation and redemption activity 11.94 % 38.31 % 27.34 %

FINANCIAL HIGHLIGHTS (Tables)

FINANCIAL HIGHLIGHTS (Tables)	12 Months Ended
FINANCIAL HIGHLIGHTS (Tables)	Dec. 31, 2019
FINANCIAL HIGHLIGHTS
Schedule of Per Share Performance Data and Other Supplemental Financial Data	The following table presents per share performance data and other supplemental financial data for the years ended December 31, 2019, 2018 and 2017 for the shareholders. This information has been derived from information presented in the financial statements. Year ended December Year ended December Year ended December 31, 2019 31, 2018 31, 2017 Per Share Operating Performance: Net asset value, beginning of year $ 10.26 $ 9.26 $ 11.75 Total income (loss) (1.74) 1.09 (2.40) Net expenses (0.09) (0.09) (0.09) Net increase (decrease) in net asset value (1.83) 1.00 (2.49) Net asset value, end of year $ 8.43 $ 10.26 $ 9.26 Total Return (17.84) % 10.80 % (21.19) % Ratios to Average Net Assets Total income (loss) (17.87) % 9.73 % (29.05) % Management fees 0.75 % 0.75 % 0.75 % Total expenses excluding management fees 1.86 % 1.08 % 0.74 % Expenses waived (1.71) % (0.93) % (0.59) % Net expenses excluding management fees 0.15 % 0.15 % 0.15 % Net income (loss) (18.77) % 8.83 % (29.95) %

QUARTERLY FINANCIAL DATA (Una_2

QUARTERLY FINANCIAL DATA (Unaudited) (Tables)	12 Months Ended
QUARTERLY FINANCIAL DATA (Unaudited) (Tables)	Dec. 31, 2019
QUARTERLY FINANCIAL DATA (Unaudited)
Schedule of Quarterly Financial Information	The following summarized (unaudited) quarterly financial information presents the results of operations and other data for the three-month periods ended March 31, June 30, September 30 and December 31, 2019 and 2018. First Second Third Fourth Quarter Quarter Quarter Quarter 2019 2019 2019 2019 Total Income (Loss) $ 123,909 $ (614,755) $ (111,493) $ (172,933) Total Expenses 31,893 31,133 25,256 25,075 Expense Waivers (20,977) (21,137) (16,088) (16,101) Net Expenses 10,916 9,996 9,168 8,974 Net Income (Loss) $ 112,993 $ (624,751) $ (120,661) $ (181,907) Net Income (Loss) per Share $ 0.24 $ (1.39) $ (0.27) $ (0.41) First Second Third Fourth Quarter Quarter Quarter Quarter 2018 2018 2018 2018 Total Income (Loss) $ 68,119 $ 144,125 $ (21,437) $ 434,163 Total Expenses 35,055 29,326 25,180 28,222 Expense Waivers (17,762) (15,329) (11,999) (14,866) Net Expenses 17,293 13,997 13,181 13,356 Net Income (Loss) $ 50,826 $ 130,128 $ (34,618) $ 420,807 Net Income (Loss) per Share $ 0.03 $ 0.20 $ (0.04) $ 0.81

FAIR VALUE OF FINANCIAL INSTR_2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	Dec. 31, 2019
FAIR VALUE OF FINANCIAL INSTRUMENTS
Schedule of UNL's Securities Using the Fair Value Hierarchy	The following table summarizes the valuation of UNL’s securities at December 31, 2019 using the fair value hierarchy: At December 31, 2019 Total Level I Level II Level III Short-Term Investments $ 3,289,117 $ 3,289,117 $ — $ — Exchange-Traded Futures Contracts United States Contracts (435,678) (435,678) — — During the year ended December 31, 2019, there were no transfers between Level I and Level II. The following table summarizes the valuation of UNL’s securities at December 31, 2018 using the fair value hierarchy: At December 31, 2018 Total Level I Level II Level III Short-Term Investments $ 5,577,527 $ 5,577,527 $ — $ — Exchange-Traded Futures Contracts United States Contracts (46,103) (46,103) — —
Schedule of Fair Value of Derivative Instruments	Fair Value of Derivative Instruments Derivatives not Accounted for Fair Value Fair Value as Hedging Statements of Financial At December 31, At December 31, Instruments Condition Location 2019 2018 Futures - Commodity Contracts Assets $ (435,678) $ (46,103)
Schedule of Effect of Derivative Instruments on the Statements of Operations	The Effect of Derivative Instruments on the Statements of Operations For the year ended For the year ended For the year ended December 31, 2019 December 31, 2018 December 31, 2017 Change in Change in Change in Derivatives Location of Realized Unrealized Realized Unrealized Realized Unrealized not Accounted Gain (Loss) Gain (Loss) Gain (Loss) on Gain (Loss) Gain (Loss) on Gain (Loss) Gain (Loss) on for as on Derivatives on Derivatives Derivatives on Derivatives Derivatives on Derivatives Derivatives Hedging Recognized in Recognized in Recognized in Recognized in Recognized in Recognized in Recognized in Instruments Income Income Income Income Income Income Income Futures - Commodity Contracts Realized gain (loss) on closed positions $ (479,014) $ (11,739) $ 229,715 Change in unrealized gain (loss) on open positions $ (389,575) $ 522,819 $ (3,364,926)

ORGANIZATION AND BUSINESS (Deta

ORGANIZATION AND BUSINESS (Details)	1 Months Ended
ORGANIZATION AND BUSINESS (Details)	Nov. 30, 2009	Nov. 18, 2009USD ($)$ / sharesshares	Dec. 31, 2019$ / shares$ / item	Dec. 31, 2018$ / shares	Dec. 31, 2017$ / shares	Dec. 31, 2016$ / shares
ORGANIZATION AND BUSINESS
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets			350
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission	30,000,000
Net asset value per share \| $ / shares		$ 50	$ 8.43	$ 10.26	$ 9.26	$ 11.75
Number of units issued \| shares		200,000
Value of unit issued \| $		$ 10,000,000
Commenced investment operations date	Nov. 18, 2009
Number of registered units			30,000,000
Creation Baskets [Member]
ORGANIZATION AND BUSINESS
Number of units per basket			50,000
Prior To July 1, 2011 [Member]
ORGANIZATION AND BUSINESS
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets			50,000

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	Dec. 31, 2019$ / item
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets	350
Redemption Baskets [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number of units per basket	50,000

FEES PAID BY THE FUND AND REL_2

FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Estimated directors fees and expenses									$ 1,096	$ 1,447	$ 1,929
Licensing fee incurred									651	964	1,576
Expense waiver	$ 16,101	$ 16,088	$ 21,137	$ 20,977	$ 14,866	$ 11,999	$ 15,329	$ 17,762	$ 74,303	59,956	61,713
Licensing Agreements [Member]
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Fee percentage									0.015%
Future Period - for the year ending December 31, 2019 [Member]
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Estimated investor tax reporting cost									$ 77,834	65,000	72,000
Future Period - for the year ending December 31, 2019 [Member] \| Maximum [Member]
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Costs and expenses annual limit for reimbursement									0.15%
UNL [Member]
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Percentage of Contractual Obligated to Pay									0.75%
Estimated directors fees and expenses									$ 1,096	1,447	1,929
UNL [Member] \| Related Public Funds [Member]
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
Estimated directors fees and expenses									$ 556,951	$ 521,689	$ 536,375

CONTRACTS AND AGREEMENTS - Brok

CONTRACTS AND AGREEMENTS - Brokerage and Futures Commissions Merchant Agreements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total commissions accrued to brokers	$ 1,231	$ 1,334	$ 2,209
Total commissions as annualized percentage of average total net assets	0.03%	0.02%	0.02%
Rebalancing Investments Transaction [Member]
Total commissions accrued to brokers	$ 1,084	$ 823	$ 1,605
Total commissions as annualized percentage of average total net assets	88.06%	61.69%	72.66%
Creation And Redemption Activity [Member]
Total commissions accrued to brokers	$ 147	$ 511	$ 604
Total commissions as annualized percentage of average total net assets	11.94%	38.31%	27.34%

CONTRACTS AND AGREEMENTS - Addi

CONTRACTS AND AGREEMENTS - Additional Information (Details)	12 Months Ended
CONTRACTS AND AGREEMENTS - Additional Information (Details)	Dec. 31, 2019USD ($)$ / item
CONTRACTS AND AGREEMENTS
Annual Fee for custody, fund accounting and fund administration services	$ 75,000
Annual Fee for transfer agency services	20,000
Maximum [Member]
CONTRACTS AND AGREEMENTS
Transaction fees per transaction	$ 15
Commissions per round-turn trade, including applicable exchange and NFA fees for Natural Gas-Related Futures Contracts and options on Futures Contracts \| $ / item	8
Minimum [Member]
CONTRACTS AND AGREEMENTS
Annual Fee for custody, fund accounting and fund administration services	$ 75,000
Transaction fees per transaction	$ 7
Commissions per round-turn trade, including applicable exchange and NFA fees for Natural Gas-Related Futures Contracts and options on Futures Contracts \| $ / item	7
first $500 million of the Related Public Funds' combined net assets [Member]
CONTRACTS AND AGREEMENTS
Fee percentage	0.06%
first $500 million of the Related Public Funds' combined net assets [Member] \| Maximum [Member]
CONTRACTS AND AGREEMENTS
Base amount for determining fee percentage	$ 500,000,000
Related Public Funds' combined net assets greater than $500 million but less than $1 billion [Member]
CONTRACTS AND AGREEMENTS
Fee percentage	0.0465%
Related Public Funds' combined net assets greater than $500 million but less than $1 billion [Member] \| Maximum [Member]
CONTRACTS AND AGREEMENTS
Base amount for determining fee percentage	$ 1,000,000,000
Related Public Funds' combined net assets greater than $500 million but less than $1 billion [Member] \| Minimum [Member]
CONTRACTS AND AGREEMENTS
Base amount for determining fee percentage	$ 500,000,000
Related Public Funds' combined net assets exceed $1 billion [Member]
CONTRACTS AND AGREEMENTS
Fee percentage	0.035%
Related Public Funds' combined net assets exceed $1 billion [Member] \| Minimum [Member]
CONTRACTS AND AGREEMENTS
Base amount for determining fee percentage	$ 1,000,000,000
Marketing Agent And Affiliate Of USCF [Member]
CONTRACTS AND AGREEMENTS
Maximum Aggregate Compensation Paid For Distribution Related Services	10.00%
Marketing Agreement [Member] \| UNL's assets up to $3 billion [Member]
CONTRACTS AND AGREEMENTS
Fee percentage	0.06%
Base amount for determining fee percentage	$ 3,000,000,000
Marketing Agreement [Member] \| UNL's assets in excess of $3 billion [Member]
CONTRACTS AND AGREEMENTS
Fee percentage	0.04%
Base amount for determining fee percentage	$ 3,000,000,000

FINANCIAL INSTRUMENTS, OFF-BA_2

FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES
Cash investments in money market funds	$ 500,000	$ 1,600,000
Deposits in domestic and foreign financial institutions	$ 3,294,705	$ 4,163,922

FINANCIAL HIGHLIGHTS (Details)

FINANCIAL HIGHLIGHTS (Details) - $ / shares	12 Months Ended
FINANCIAL HIGHLIGHTS (Details) - $ / shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Per Share Operating Performance:
Net asset value, beginning of year	$ 10.26	$ 9.26	$ 11.75
Total income (loss)	(1.74)	1.09	(2.40)
Net expenses	(0.09)	(0.09)	(0.09)
Net increase (decrease) in net asset value	(1.83)	1	(2.49)
Net asset value, end of year	$ 8.43	$ 10.26	$ 9.26
Total Return	(17.84%)	10.80%	(21.19%)
Ratios to Average Net Assets
Total income (loss)	(17.87%)	9.73%	(29.05%)
Management fees	0.75%	0.75%	0.75%
Total expenses excluding management fees	1.86%	1.08%	0.74%
Expenses waived	(1.71%)	(0.93%)	(0.59%)
Net expenses excluding management fees	0.15%	0.15%	0.15%
Net income (loss)	(18.77%)	8.83%	(29.95%)

QUARTERLY FINANCIAL DATA (Una_3

QUARTERLY FINANCIAL DATA (Unaudited) (Quarterly Financial Information Presents The Results Of Operations) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
QUARTERLY FINANCIAL DATA (Unaudited)
Total Income (Loss)	$ (172,933)	$ (111,493)	$ (614,755)	$ 123,909	$ 434,163	$ (21,437)	$ 144,125	$ 68,119	$ (775,272)	$ 624,970	$ (3,051,918)
Total Expenses	25,075	25,256	31,133	31,893	28,222	25,180	29,326	35,055	113,357	117,783	156,278
Expense Waivers	(16,101)	(16,088)	(21,137)	(20,977)	(14,866)	(11,999)	(15,329)	(17,762)	(74,303)	(59,956)	(61,713)
Net expenses	8,974	9,168	9,996	10,916	13,356	13,181	13,997	17,293	39,054	57,827	94,565
Net Income (Loss)	$ (181,907)	$ (120,661)	$ (624,751)	$ 112,993	$ 420,807	$ (34,618)	$ 130,128	$ 50,826	$ (814,326)	$ 567,143	$ (3,146,483)
Net Income (Loss) per Share	$ (0.41)	$ (0.27)	$ (1.39)	$ 0.24	$ 0.81	$ (0.04)	$ 0.20	$ 0.03	$ (1.83)	$ 1	$ (2.49)

FAIR VALUE OF FINANCIAL INSTR_3

FAIR VALUE OF FINANCIAL INSTRUMENTS - UNL's Securities Fair Value Hierarchy (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
United States [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	$ (435,678)	$ (46,103)
Short-Term Investments [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	3,289,117	5,577,527
Fair Value, Inputs, Level 1 [Member] \| United States [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	(435,678)	(46,103)
Fair Value, Inputs, Level 1 [Member] \| Short-Term Investments [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	3,289,117	5,577,527
Fair Value, Inputs, Level 2 [Member] \| United States [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	0	0
Fair Value, Inputs, Level 2 [Member] \| Short-Term Investments [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	0	0
Fair Value, Inputs, Level 3 [Member] \| United States [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	0	0
Fair Value, Inputs, Level 3 [Member] \| Short-Term Investments [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Securities, fair value	$ 0	$ 0

FAIR VALUE OF FINANCIAL INSTR_4

FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Derivative Instruments (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
FAIR VALUE OF FINANCIAL INSTRUMENTS
Derivatives not Accounted for as Hedging Instruments	$ (435,678)	$ (46,103)
Commodity Contracts [Member] \| Futures [Member] \| Assets [Member]
FAIR VALUE OF FINANCIAL INSTRUMENTS
Derivatives not Accounted for as Hedging Instruments	$ (435,678)	$ (46,103)

FAIR VALUE OF FINANCIAL INSTR_5

FAIR VALUE OF FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on Condensed Statements of Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
FAIR VALUE OF FINANCIAL INSTRUMENTS
Realized Gain (Loss) on Derivatives Recognized in Income	$ (479,014)	$ (11,739)	$ 229,715
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	(389,575)	522,819	(3,364,926)
Commodity Contracts [Member] \| Not Designated as Hedging Instrument [Member] \| Realized gain (loss) on closed futures contracts
FAIR VALUE OF FINANCIAL INSTRUMENTS
Realized Gain (Loss) on Derivatives Recognized in Income	(479,014)	(11,739)	229,715
Commodity Contracts [Member] \| Not Designated as Hedging Instrument [Member] \| Change in unrealized gain (loss) on open positions
FAIR VALUE OF FINANCIAL INSTRUMENTS
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	$ (389,575)	$ 522,819	$ (3,364,926)