Condensed Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	$ (30,279,328)	$ (56,209,907)	$ 24,220,537
Change in unrealized gain (loss) on open positions	17,876,577	(23,145,242)	5,699,448
Realized gain (loss) on foreign currency transactions		51	(31)
Realized gain (loss) on short-term investments	59	(286)	(23)
Change in unrealized gain (loss) on foreign currency translations		(13)	612
Dividend income	469,606	425,685	0
Interest income	7,658,530	10,030,763	4,112,328
ETF transaction fees	33,250	31,150	20,300
Total income (loss)	(4,241,306)	(68,867,799)	34,053,171
Expenses
Management fees (Note 4)	2,846,986	4,730,151	4,205,743
Professional fees	551,917	773,654	719,854
Brokerage commissions	460,079	546,563	534,994
Directors' fees and insurance	110,755	94,778	72,525
Total expenses	3,969,737	6,145,146	5,533,116
Expense waiver (Note 4)	(67,628)	(77,884)	(85,686)
Net expenses	3,902,109	6,067,262	5,447,430
Net income (loss)	(8,143,415)	(74,935,061)	28,605,741
United States Commodity Index Fund
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	(29,144,478)	(54,710,680)	22,989,718
Change in unrealized gain (loss) on open positions	16,626,852	(21,360,954)	4,817,510
Dividend income	445,188	409,565	0
Interest income	7,449,252	9,827,503	4,017,753
ETF transaction fees	26,950	26,600	15,750
Total income (loss)	(4,596,236)	(65,807,966)	31,840,731
Expenses
Management fees (Note 4)	2,778,400	4,645,618	4,126,513
Professional fees	476,864	685,742	626,130
Brokerage commissions	453,997	539,884	527,610
Directors' fees and insurance	108,435	91,761	69,558
Total expenses	3,817,696	5,963,005	5,349,811
Net income (loss)	$ (8,413,932)	$ (71,770,971)	$ 26,490,920
Net income (loss) per share (in dollars per share)	$ (0.62)	$ (4.99)	$ 2.46
Net income (loss) per weighted average share (in dollars per share)	$ (0.91)	$ (5.21)	$ 2.04
Weighted average shares outstanding (in shares)	9,286,164	13,764,384	12,996,575
United States Copper Index Fund
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	$ (1,134,850)	$ (1,318,188)	$ 1,468,825
Change in unrealized gain (loss) on open positions	1,249,725	(1,785,413)	793,363
Realized gain (loss) on short-term investments	59	0	(23)
Dividend income	24,418	13,343	0
Interest income	209,278	187,804	80,677
ETF transaction fees	6,300	4,550	4,550
Total income (loss)	354,930	(2,897,904)	2,347,392
Expenses
Management fees (Note 4)	68,586	76,916	67,217
Professional fees	75,053	61,767	48,451
Brokerage commissions	6,082	5,181	5,461
Directors' fees and insurance	2,320	2,100	1,823
Total expenses	152,041	145,964	122,952
Expense waiver (Note 4)	(67,628)	(51,300)	(40,153)
Net expenses	84,413	94,664	82,799
Net income (loss)	$ 270,517	$ (2,992,568)	$ 2,264,593
Net income (loss) per share (in dollars per share)	$ 1.10	$ (4.61)	$ 4.69
Net income (loss) per weighted average share (in dollars per share)	$ 0.44	$ (4.70)	$ 3.92
Weighted average shares outstanding (in shares)	615,753	636,986	577,397
USCF Crescent Crypto Index Fund
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	$ 0
Change in unrealized gain (loss) on open positions	0
Realized gain (loss) on foreign currency transactions	0
Change in unrealized gain (loss) on foreign currency translations	0
Interest income	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
Expense waiver (Note 4)	0
Net 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