Condensed Statements of Operations - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Expenses
Net Income (Loss)				$ (32,807,530)	$ (14,762,809)
Maximum
Expenses
Paid in kind interest as a percentage of total interest income		5.00%	5.00%	5.00%	5.00%
United States Commodity Index Fund
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed commodity futures contracts		$ 11,808,620	$ (12,236,395)	$ (40,973,466)	$ (27,969,141)
Change in unrealized gain (loss) on open commodity futures contracts		3,723,138	(21,772)	3,342,751	9,989,137
Realized gain (loss) on short-term investments		0	0	2,279,102	0
Dividend income		22,575	123,867	96,177	338,958
Interest income	[1]	44,209	1,602,319	944,811	6,480,360
ETF transaction fees		2,450	8,400	8,050	21,000
Total Income (Loss)		15,600,992	(10,523,581)	(34,302,575)	(11,139,686)
Expenses
Management fees (Note 4)		250,265	621,049	819,733	2,322,965
Professional fees		54,226	75,905	168,185	399,502
Brokerage commissions		31,187	104,902	107,561	410,699
Directors' fees and insurance		7,287	31,881	41,006	78,744
Total Expenses		342,965	833,737	1,136,485	3,211,910
Net Income (Loss)		$ 15,258,027	$ (11,357,318)	$ (35,439,060)	$ (14,351,596)
Net Income (Loss) per share (in dollars per share)		$ 3.09	$ (1.14)	$ (7.14)	$ (1.65)
Net Income (Loss) per weighted average share (in dollars per share)		$ 3.56	$ (1.32)	$ (7.58)	$ (1.39)
Weighted average shares outstanding (in shares)		4,288,587	8,573,913	4,674,818	10,308,242
United States Commodity Index Fund | Maximum
Expenses
Paid in kind interest as a percentage of total interest income		5.00%	5.00%	5.00%	5.00%
United States Copper Index Fund
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed commodity futures contracts		$ 2,112,187	$ (69,112)	$ 1,391,750	$ (1,250,775)
Change in unrealized gain (loss) on open commodity futures contracts		212,313	(458,688)	1,264,638	703,250
Realized gain (loss) on short-term investments		0	17	0	59
Dividend income		4,378	5,782	9,723	20,159
Interest income	[1]	3,095	47,289	44,517	179,298
ETF transaction fees		5,250	1,050	8,404	5,250
Total Income (Loss)		2,337,223	(473,662)	2,719,032	(342,759)
Expenses
Management fees (Note 4)		41,253	15,248	71,096	55,619
Professional fees		23,409	14,121	50,397	62,718
Brokerage commissions		1,672	945	4,240	4,792
Directors' fees and insurance		599	599	1,539	1,743
Total Expenses		66,933	30,913	127,272	124,872
Expense waiver (Note 4)		(16,161)	(12,147)	(39,770)	(56,418)
Net Expenses		50,772	18,766	87,502	68,454
Net Income (Loss)		$ 2,286,451	$ (492,428)	$ 2,631,530	$ (411,213)
Net Income (Loss) per share (in dollars per share)		$ 1.78	$ (0.83)	$ 1.23	$ (0.28)
Net Income (Loss) per weighted average share (in dollars per share)		$ 1.65	$ (0.87)	$ 3.06	$ (0.62)
Weighted average shares outstanding (in shares)		1,384,239	564,130	860,219	664,835
United States Copper Index Fund | Maximum
Expenses
Paid in kind interest as a percentage of total interest income		5.00%	5.00%	5.00%	5.00%
USCF Crescent Crypto Index Fund
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed commodity futures contracts		$ 0
Change in unrealized gain (loss) on open commodity futures contracts		0
Realized gain (loss) on short-term investments		0
Dividend income		0
Interest income		0
ETF transaction fees		0
Total Income (Loss)		0
Expenses
Management fees (Note 4)		0
Professional fees		0
Brokerage commissions		0
Directors' fees and insurance		0
Total Expenses		0
Net Income (Loss)		$ 0
Net Income (Loss) per share (in dollars per share)		$ 0
Net Income (Loss) per weighted average share (in dollars per share)		$ 0
Weighted average shares outstanding (in shares)		0
United States Commodity Index Funds Trust
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed commodity futures contracts		$ 13,920,807	$ (12,305,507)	$ (39,581,716)	$ (29,219,916)
Change in unrealized gain (loss) on open commodity futures contracts		3,935,451	(480,460)	4,607,389	10,692,387
Realized gain (loss) on short-term investments		0	17	2,279,102	59
Dividend income		26,953	129,649	105,900	359,117
Interest income	[1]	47,304	1,649,608	989,328	6,659,658
ETF transaction fees		7,700	9,450	16,454	26,250
Total Income (Loss)		17,938,215	(10,997,243)	(31,583,543)	(11,482,445)
Expenses
Management fees (Note 4)		291,518	636,297	890,829	2,378,584
Professional fees		77,635	90,026	218,582	462,220
Brokerage commissions		32,859	105,847	111,801	415,491
Directors' fees and insurance		7,886	32,480	42,545	80,487
Total Expenses		409,898	864,650	1,263,757	3,336,782
Expense waiver (Note 4)		(16,161)	(12,147)	(39,770)	(56,418)
Net Expenses		393,737	852,503	1,223,987	3,280,364
Net Income (Loss)		$ 17,544,478	$ (11,849,746)	$ (32,807,530)	$ (14,762,809)

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