Condensed Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Expenses
Net Income (Loss)			$ 41,946,702	$ (32,807,530)
United States Commodity Index Fund
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed commodity futures contracts	$ 7,864,276	$ 11,808,620	42,739,282	(40,973,466)
Change in unrealized gain (loss) on open commodity futures contracts	(4,448,960)	3,723,138	(1,326,932)	3,342,751
Realized gain (loss) on short-term investments	0	0	0	2,279,102
Dividend income	14,099	22,575	32,874	96,177
Interest income	40	44,209	2,130	944,811
ETF transaction fees	1,400	2,450	10,500	8,050
Total Income (Loss)	3,430,855	15,600,992	41,457,854	(34,302,575)
Expenses
Management fees (Note 4)	475,583	250,265	1,185,264	819,733
Professional fees	46,921	54,226	166,478	168,185
Brokerage commissions	43,611	31,187	111,271	107,561
Directors' fees and insurance	12,659	7,287	32,207	41,006
Registration fees	9,979	0	22,996	0
Total Expenses	588,753	342,965	1,518,216	1,136,485
Net Income (Loss)	$ 2,842,102	$ 15,258,027	$ 39,939,638	$ (35,439,060)
Net Income (Loss) per share (in dollars per share)	$ 0.50	$ 3.09	$ 8.38	$ (7.14)
Net Income (Loss) per weighted average share (in dollars per share)	$ 0.48	$ 3.56	$ 7.73	$ (7.58)
Weighted average shares outstanding (in shares)	5,872,283	4,288,587	5,167,399	4,674,818
United States Copper Index Fund
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed commodity futures contracts	$ (11,679,550)	$ 2,112,187	$ 11,298,613	$ 1,391,750
Change in unrealized gain (loss) on open commodity futures contracts	(2,149,542)	212,313	(7,872,897)	1,264,638
Dividend income	17,060	4,378	40,460	9,723
Interest income	60	3,095	2,214	44,517
ETF transaction fees	5,950	5,250	29,050	8,404
Total Income (Loss)	(13,806,022)	2,337,223	3,497,440	2,719,032
Expenses
Management fees (Note 4)	466,695	41,253	1,139,240	71,096
Professional fees	78,933	23,409	245,008	50,397
Brokerage commissions	26,710	1,672	49,032	4,240
Directors' fees and insurance	15,365	599	38,381	1,539
Registration fees	35,750	0	81,989	0
Total Expenses	623,453	66,933	1,553,650	127,272
Expense waiver (Note 4)	0	(16,161)	(63,274)	(39,770)
Net Expenses	623,453	50,772	1,490,376	87,502
Net Income (Loss)	$ (14,429,475)	$ 2,286,451	$ 2,007,064	$ 2,631,530
Net Income (Loss) per share (in dollars per share)	$ (1.27)	$ 1.78	$ 3.31	$ 1.23
Net Income (Loss) per weighted average share (in dollars per share)	$ (1.34)	$ 1.65	$ 0.22	$ 3.06
Weighted average shares outstanding (in shares)	10,757,609	1,384,239	8,947,802	860,219
USCF Crescent Crypto Index Fund
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed commodity futures contracts	$ 0	$ 0	$ 0	$ 0
Change in unrealized gain (loss) on open commodity futures contracts	0	0	0	0
Dividend income	0	0	0	0
Interest income	0	0	0	0
ETF transaction fees	0	0	0	0
Total Income (Loss)	0	0	0	0
Expenses
Management fees (Note 4)	0	0	0	0
Professional fees	0	0	0	0
Brokerage commissions	0	0	0	0
Directors' fees and insurance	0	0	0	0
Total Expenses	0	0	0	0
Net Income (Loss)	$ 0	$ 0	$ 0	$ 0
Net Income (Loss) per share (in dollars per share)	$ 0	$ 0	$ 0	$ 0
Net Income (Loss) per weighted average share (in dollars per share)	$ 0	$ 0	$ 0	$ 0
Weighted average shares outstanding (in shares)	0	0	0	0
United States Commodity Index Funds Trust
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed commodity futures contracts	$ (3,815,274)	$ 13,920,807	$ 54,037,895	$ (39,581,716)
Change in unrealized gain (loss) on open commodity futures contracts	(6,598,502)	3,935,451	(9,199,829)	4,607,389
Realized gain (loss) on short-term investments	0	0	0	2,279,102
Dividend income	31,159	26,953	73,334	105,900
Interest income	100	47,304	4,344	989,328
ETF transaction fees	7,350	7,700	39,550	16,454
Total Income (Loss)	(10,375,167)	17,938,215	44,955,294	(31,583,543)
Expenses
Management fees (Note 4)	942,278	291,518	2,324,504	890,829
Professional fees	125,854	77,635	411,486	218,582
Brokerage commissions	70,321	32,859	160,303	111,801
Directors' fees and insurance	28,024	7,886	70,588	42,545
Registration fees	45,729	0	104,985	0
Total Expenses	1,212,206	409,898	3,071,866	1,263,757
Expense waiver (Note 4)	0	(16,161)	(63,274)	(39,770)
Net Expenses	1,212,206	393,737	3,008,592	1,223,987
Net Income (Loss)	$ (11,587,373)	$ 17,544,478	$ 41,946,702	$ (32,807,530)