Condensed Statement of Changes in Capital - USD ($)	3 Months Ended				8 Months Ended	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balances, Beginning		$ 474,547,403		$ 515,622,796		$ 474,547,403	$ 515,622,796	$ 643,918,233
Additions						7,153,775	192,092,755	62,471,914
Redemptions						(276,645,904)	(158,233,087)	(219,373,092)
Net income (loss)						(8,143,415)	(74,935,061)	28,605,741
Balances, Ending	$ 196,911,859		$ 474,547,403		$ 196,911,859	$ 196,911,859	$ 474,547,403	$ 515,622,796
Shares Outstanding, Beginning		13,050,000		12,500,000		13,050,000	12,500,000	16,350,000
Additions						400,000	4,700,000	1,950,000
Redemptions						(7,900,000)	(4,150,000)	(5,800,000)
Shares Outstanding, Ending	5,550,000		13,050,000		5,550,000	5,550,000	13,050,000	12,500,000
United States Commodity Index Fund
Balances, Beginning		$ 463,042,508		$ 501,241,910		$ 463,042,508	$ 501,241,910	$ 636,292,824
Additions							183,685,233	49,804,005
Redemptions						(264,733,094)	(150,113,664)	(211,345,839)
Net income (loss)	$ 5,937,664	$ 16,243,487	$ (67,167,271)	$ 2,873,099		(8,413,932)	(71,770,971)	26,490,920
Balances, Ending	$ 189,895,482		$ 463,042,508		$ 189,895,482	$ 189,895,482	$ 463,042,508	$ 501,241,910
Shares Outstanding, Beginning		12,350,000		11,800,000		12,350,000	11,800,000	15,900,000
Additions							4,250,000	1,250,000
Redemptions						(7,200,000)	(3,700,000)	(5,350,000)
Shares Outstanding, Ending	5,150,000		12,350,000		5,150,000	5,150,000	12,350,000	11,800,000
Net Asset Value Per Share:
Net asset value, beginning of period (in dollars per share)		$ 37.49		$ 42.48		$ 37.49	$ 42.48	$ 40.02
Net asset value, end of period (in dollars per share)	$ 36.87		$ 37.49		$ 36.87	$ 36.87	$ 37.49	$ 42.48
United States Copper Index Fund
Balances, Beginning		$ 11,504,895		$ 12,629,903		$ 11,504,895	$ 12,629,903	$ 5,724,654
Additions						7,152,775	8,406,522	12,667,909
Redemptions						(11,912,810)	(6,538,962)	(8,027,253)
Net income (loss)	$ 681,730	$ 1,219,154	$ (769,679)	$ (1,206,325)		270,517	(2,992,568)	2,264,593
Balances, Ending	$ 7,015,377		$ 11,504,895		$ 7,015,377	$ 7,015,377	$ 11,504,895	$ 12,629,903
Shares Outstanding, Beginning		700,000		600,000		700,000	600,000	350,000
Additions						400,000	450,000	700,000
Redemptions						(700,000)	(350,000)	(450,000)
Shares Outstanding, Ending	400,000		700,000		400,000	400,000	700,000	600,000
Net Asset Value Per Share:
Net asset value, beginning of period (in dollars per share)		$ 16.44		$ 21.05		$ 16.44	$ 21.05	$ 16.36
Net asset value, end of period (in dollars per share)	$ 17.54		$ 16.44		$ 17.54	$ 17.54	$ 16.44	$ 21.05
USCF Crescent Crypto Index Fund
Balances, Beginning					$ 0
Additions					1,000
Net income (loss)					0	$ 0
Balances, Ending	$ 1,000				1,000	1,000
Sponsor
Balances, Beginning		$ 0		$ 0		0	$ 0	$ 0
Additions						1,000	1,000	0
Redemptions						0	(1,000)	0
Net income (loss)						0	0	0
Balances, Ending	$ 1,000		$ 0		$ 1,000	$ 1,000	$ 0	$ 0
Shares Outstanding, Beginning		0		0		0	0	0
Additions						0	0	0
Redemptions						0	0	0
Shares Outstanding, Ending	0		0		0	0	0	0
Sponsor | United States Commodity Index Fund
Balances, Beginning		$ 0		$ 0		$ 0	$ 0	$ 0
Additions							0	0
Redemptions						0	0	0
Net income (loss)						0	0	0
Balances, Ending	$ 0		$ 0		$ 0	$ 0	$ 0	$ 0
Shares Outstanding, Beginning		0		0		0	0	0
Additions							0	0
Redemptions						0	0	0
Shares Outstanding, Ending	0		0		0	0	0	0
Sponsor | United States Copper Index Fund
Balances, Beginning		$ 0		$ 0		$ 0	$ 0	$ 0
Additions						0	0	0
Redemptions						0	0	0
Net income (loss)						0	0	0
Balances, Ending	$ 0		$ 0		$ 0	$ 0	$ 0	$ 0
Shares Outstanding, Beginning		0		0		0	0	0
Additions						0	0	0
Redemptions						0	0	0
Shares Outstanding, Ending	0		0		0	0	0	0
Sponsor | USCF Crescent Crypto Index Fund
Balances, Beginning					$ 0
Additions					1,000
Net income (loss)					0
Balances, Ending	$ 1,000				1,000	$ 1,000
Shareholders
Balances, Beginning		$ 474,547,403		$ 515,622,796		474,547,403	$ 515,622,796	$ 643,918,233
Additions						7,152,775	192,091,755	62,471,914
Redemptions						(276,645,904)	(158,232,087)	(219,373,092)
Net income (loss)						(8,143,415)	(74,935,061)	28,605,741
Balances, Ending	$ 196,910,859		$ 474,547,403		$ 196,910,859	$ 196,910,859	$ 474,547,403	$ 515,622,796
Shares Outstanding, Beginning		13,050,000		12,500,000		13,050,000	12,500,000	16,350,000
Additions						400,000	4,700,000	1,950,000
Redemptions						(7,900,000)	(4,150,000)	(5,800,000)
Shares Outstanding, Ending	5,550,000		13,050,000		5,550,000	5,550,000	13,050,000	12,500,000
Shareholders | United States Commodity Index Fund
Balances, Beginning		$ 463,042,508		$ 501,241,910		$ 463,042,508	$ 501,241,910	$ 636,292,824
Additions							183,685,233	49,804,005
Redemptions						(264,733,094)	(150,113,664)	(211,345,839)
Net income (loss)						(8,413,932)	(71,770,971)	26,490,920
Balances, Ending	$ 189,895,482		$ 463,042,508		$ 189,895,482	$ 189,895,482	$ 463,042,508	$ 501,241,910
Shares Outstanding, Beginning		12,350,000		11,800,000		12,350,000	11,800,000	15,900,000
Additions							4,250,000	1,250,000
Redemptions						(7,200,000)	(3,700,000)	(5,350,000)
Shares Outstanding, Ending	5,150,000		12,350,000		5,150,000	5,150,000	12,350,000	11,800,000
Shareholders | United States Copper Index Fund
Balances, Beginning		$ 11,504,895		$ 12,629,903		$ 11,504,895	$ 12,629,903	$ 5,724,654
Additions						7,152,775	8,406,522	12,667,909
Redemptions						(11,912,810)	(6,538,962)	(8,027,253)
Net income (loss)						270,517	(2,992,568)	2,264,593
Balances, Ending	$ 7,015,377		$ 11,504,895		$ 7,015,377	$ 7,015,377	$ 11,504,895	$ 12,629,903
Shares Outstanding, Beginning		700,000		600,000		700,000	600,000	350,000
Additions						400,000	450,000	700,000
Redemptions						(700,000)	(350,000)	(450,000)
Shares Outstanding, Ending	400,000		700,000		400,000	400,000	700,000	600,000
Shareholders | USCF Crescent Crypto Index Fund
Balances, Beginning					$ 0
Additions					0
Net income (loss)					0
Balances, Ending	$ 0				$ 0	$ 0