Condensed Statements of Cash Flows (Parenthetical) - USD ($)		Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	May 08, 2019	Dec. 31, 2018
Components of Cash and Cash Equivalents:
Cash and cash Equivalents		$ 124,713,160		$ 234,822,556
Equity in Trading Accounts:
Cash and cash Equivalents		3,746,721		28,667,516
Total Cash, Cash Equivalents and Equity in Trading Accounts		128,459,881	$ 197,413,898	263,490,072		$ 490,625,457
United States Commodity Index Fund
Components of Cash and Cash Equivalents:
Cash and cash Equivalents		98,495,028	163,036,680	228,152,103
Equity in Trading Accounts:
Cash and cash Equivalents		3,408,539		27,863,167
Total Cash, Cash Equivalents and Equity in Trading Accounts		101,903,567	190,313,994	256,015,270		478,509,213
Sponsor Capital Account		0	0
United States Copper Index Fund
Components of Cash and Cash Equivalents:
Cash and cash Equivalents		26,218,132	6,699,854	6,669,453
Equity in Trading Accounts:
Cash and cash Equivalents		338,182		804,349
Total Cash, Cash Equivalents and Equity in Trading Accounts		26,556,314	7,098,904	7,473,802		12,116,244
Sponsor Capital Account		0	0
USCF Crescent Crypto Index Fund
Components of Cash and Cash Equivalents:
Cash and cash Equivalents		0	1,000	1,000
Equity in Trading Accounts:
Cash and cash Equivalents	[1]	0		0
Total Cash, Cash Equivalents and Equity in Trading Accounts		0	1,000	$ 1,000		$ 0
Sponsor Capital Account		0	1,000		$ 1,000
United States Commodity Index Funds Trust
Components of Cash and Cash Equivalents:
Cash and cash Equivalents		124,713,160	169,737,534
Equity in Trading Accounts:
Sponsor Capital Account		$ 0	$ 1,000

[1] All short contracts are offset by long positions in Commodity Futures Contracts and are acquired solely for the purpose of reducing a long position (e.g., due to a redemption or to reflect a rebalancing of the SDCI).