Condensed Statement of Changes in Capital - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019	May 08, 2019
Net income (loss)			$ (32,807,530)	$ (14,762,809)
United States Commodity Index Fund
Balances, Beginning			189,895,482
Net income (loss)	$ 15,258,027	$ (11,357,318)	(35,439,060)	(14,351,596)
Balances, Ending	107,028,120		107,028,120
Sponsors' shares capital	107,028,120		189,895,482		$ 107,028,120	$ 189,895,482
Sponsor					0	0
United States Copper Index Fund
Balances, Beginning			7,015,377
Net income (loss)	2,286,451	(492,428)	2,631,530	(411,213)
Balances, Ending	28,151,482		28,151,482
Sponsors' shares capital	28,151,482		7,015,377		28,151,482	7,015,377
Sponsor					0	0
USCF Crescent Crypto Index Fund
Balances, Beginning			1,000
Net income (loss)	0
Balances, Ending	0		0
Sponsors' shares capital	0		1,000		0	1,000
Sponsor					0	1,000	$ 1,000
United States Commodity Index Funds Trust
Balances, Beginning			196,911,859
Net income (loss)	17,544,478	(11,849,746)	(32,807,530)	(14,762,809)
Balances, Ending	135,179,602		135,179,602
Sponsors' shares capital	135,179,602		196,911,859		135,179,602	196,911,859
Sponsor					$ 0	1,000
Sponsor | United States Commodity Index Fund
Balances, Ending	$ 0	$ 0	$ 0	$ 0
Shares Outstanding, Ending	0	0	0	0
Sponsors' shares outstanding	0	0	0	0	0
Sponsors' shares capital	$ 0	$ 0	$ 0	$ 0	$ 0
Sponsor | United States Copper Index Fund
Balances, Ending	$ 0	$ 0	$ 0	$ 0
Shares Outstanding, Ending	0	0	0	0
Sponsors' shares outstanding	0	0	0	0	0
Sponsors' shares capital	$ 0	$ 0	$ 0	$ 0	$ 0
Sponsor | USCF Crescent Crypto Index Fund
Balances, Beginning	0		1,000	0
Additions	0		0	1,000
Redemptions	0		(1,000)	0
Net income (loss)	0		0	0
Balances, Ending	0	1,000	0	1,000
Sponsors' shares capital	0	1,000	0	1,000	$ 0	1,000
Sponsor							$ 1,000
Sponsor | United States Commodity Index Funds Trust
Balances, Ending	$ 0	$ 1,000	$ 0	$ 1,000
Shares Outstanding, Ending	0	0	0	0
Sponsors' shares outstanding	0	0	0	0	0
Sponsors' shares capital	$ 0	$ 1,000	$ 0	$ 1,000	$ 0
Shareholders | United States Commodity Index Fund
Balances, Beginning	126,548,740	349,433,442	189,895,482	463,042,508
Additions	8,105,031		18,654,333
Redemptions	(42,883,678)	(89,018,908)	(66,082,635)	(199,633,696)
Net income (loss)	15,258,027	(11,357,318)	(35,439,060)	(14,351,596)
Balances, Ending	$ 107,028,120	$ 249,057,216	$ 107,028,120	$ 249,057,216
Additions	300,000	0	650,000	0
Redemptions	(1,450,000)	(2,500,000)	(2,200,000)	(5,400,000)
Sponsors' shares capital	$ 107,028,120	$ 249,057,216	$ 107,028,120	$ 249,057,216	107,028,120	189,895,482
Shareholders | United States Copper Index Fund
Balances, Beginning	15,293,972	11,041,185	7,015,377	11,504,895
Additions	21,609,433	0	30,237,701	6,328,250
Redemptions	(11,038,374)	(3,274,511)	(11,733,126)	(10,147,686)
Net income (loss)	2,286,451	(492,428)	2,631,530	(411,213)
Balances, Ending	$ 28,151,482	$ 7,274,246	$ 28,151,482	$ 7,274,246
Additions	1,200,000	0	1,750,000	350,000
Redemptions	(600,000)	(200,000)	(650,000)	(600,000)
Sponsors' shares capital	$ 28,151,482	$ 7,274,246	$ 28,151,482	$ 7,274,246	$ 28,151,482	7,015,377
Shareholders | USCF Crescent Crypto Index Fund
Balances, Ending	$ 0	$ 0	$ 0	$ 0
Shares Outstanding, Ending	0	0	0	0
Sponsors' shares outstanding	0	0	0	0	0
Sponsors' shares capital	$ 0	$ 0	$ 0	$ 0	$ 0
Shareholders | United States Commodity Index Funds Trust
Balances, Beginning	141,842,712	360,475,627	196,911,859	474,547,403
Additions	29,714,464	0	48,892,034	6,329,250
Redemptions	(53,922,052)	(92,293,419)	(77,816,761)	(209,781,382)
Net income (loss)	17,544,478	(11,849,746)	(32,807,530)	(14,762,809)
Balances, Ending	$ 135,179,602	$ 256,332,462	$ 135,179,602	$ 256,332,462
Additions	1,500,000		2,400,000	350,000
Redemptions	(2,050,000)	(2,700,000)	(2,850,000)	(6,000,000)
Sponsors' shares capital	$ 135,179,602	$ 256,332,462	$ 135,179,602	$ 256,332,462	$ 135,179,602	$ 196,911,859