Condensed Statements of Cash Flows (Parenthetical) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents	$ 169,737,534	$ 438,410,816	$ 401,910,152
Equity in Trading Accounts:
Cash and Cash Equivalents	27,676,364	52,214,641	33,566,380
Total Cash, Cash Equivalents and Equity in Trading Accounts	197,413,898	490,625,457	435,476,532	$ 648,947,187
Sponsor Capital Account	1,000	0
United States Commodity Index Fund
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents	163,036,680	427,657,030	393,488,946
Equity in Trading Accounts:
Cash and Cash Equivalents	27,277,314	50,852,183	32,608,929
Total Cash, Cash Equivalents and Equity in Trading Accounts	190,313,994	478,509,213	426,097,875	641,316,546
Sponsor Capital Account	0	0
United States Copper Index Fund
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents	6,699,854	10,753,786	7,124,096
Equity in Trading Accounts:
Cash and Cash Equivalents	399,050	1,362,458	798,079
Total Cash, Cash Equivalents and Equity in Trading Accounts	7,098,904	12,116,244	$ 7,922,175	$ 5,640,820
Sponsor Capital Account	0	0
USCF Crescent Crypto Index Fund
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents	1,000
Equity in Trading Accounts:
Cash and Cash Equivalents	0
Total Cash, Cash Equivalents and Equity in Trading Accounts	1,000	0
Sponsor Capital Account	1,000
United States Commodity Index Funds Trust
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents	$ 169,737,534	$ 438,410,816