Condensed Schedule of Investments (Parenthetical)	3 Months Ended
	Mar. 31, 2019 USD ($)
United States Commodity Index Fund [Member]
Debt Instrument, Collateral Amount	$ 35,952,692
Interest rate	0.005%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.41%, 4/04/2019 [Member]
Expiration date	4/04/2019
Interest rate	2.41%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.43%, 4/11/2019 [Member]
Expiration date	4/11/2019
Interest rate	2.43%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.36%, 4/18/2019 [Member]
Expiration date	4/18/2019
Interest rate	2.36%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.33%, 4/25/2019 [Member]
Expiration date	4/25/2019
Interest rate	2.33%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.46%, 5/02/2019 [Member]
Expiration date	5/02/2019
Interest rate	2.46%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.44%, 5/09/2019 [Member]
Expiration date	5/09/2019
Interest rate	2.44%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.43%, 5/23/2019 [Member]
Expiration date	5/23/2019
Interest rate	2.43%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.42%, 5/30/2019 [Member]
Expiration date	5/30/2019
Interest rate	2.42%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.51%, 6/06/2019 [Member]
Expiration date	6/06/2019
Interest rate	2.51%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.41%, 6/13/2019 [Member]
Expiration date	6/13/2019
Interest rate	2.41%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.41%, 6/20/2019 [Member]
Expiration date	6/20/2019
Interest rate	2.41%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.49%, 6/27/2019 [Member]
Expiration date	6/27/2019
Interest rate	2.49%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.44%, 7/05/2019 [Member]
Expiration date	7/05/2019
Interest rate	2.44%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.46%, 7/11/2019 [Member]
Expiration date	7/11/2019
Interest rate	2.46%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.42%, 7/18/2019 [Member]
Expiration date	7/18/2019
Interest rate	2.42%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.44%, 7/25/2019 [Member]
Expiration date	7/25/2019
Interest rate	2.44%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.46%, 8/08/2019 [Member]
Expiration date	8/08/2019
Interest rate	2.46%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.47%, 8/15/2019 [Member]
Expiration date	8/15/2019
Interest rate	2.47%
United States Copper Index Fund [Member]
Debt Instrument, Collateral Amount	$ 599,223
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.40%, 4/04/2019 [Member]
Expiration date	4/04/2019
Interest rate	2.40%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.43%, 4/11/2019 [Member]
Expiration date	4/11/2019
Interest rate	2.43%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.44%, 4/18/2019 [Member]
Expiration date	4/18/2019
Interest rate	2.44%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.36%, 4/25/2019 [Member]
Expiration date	4/25/2019
Interest rate	2.36%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.38%, 5/16/2019 [Member]
Expiration date	5/02/2019
Interest rate	2.41%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.47%, 5/09/2019 [Member]
Expiration date	5/09/2019
Interest rate	2.47%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.38%, 5/16/2019 [Member]
Expiration date	5/16/2019
Interest rate	2.38%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.45%, 5/23/2019 [Member]
Expiration date	5/23/2019
Interest rate	2.45%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.42%, 5/30/2019 [Member]
Expiration date	5/30/2019
Interest rate	2.42%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.41%, 6/06/2019 [Member]
Expiration date	6/06/2019
Interest rate	2.41%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.41%, 6/13/2019 [Member]
Expiration date	6/13/2019
Interest rate	2.41%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.44%, 6/20/2019 [Member]
Expiration date	6/20/2019
Interest rate	2.44%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.49%, 6/27/2019 [Member]
Expiration date	6/27/2019
Interest rate	2.49%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.44%, 7/05/2019 [Member]
Expiration date	7/05/2019
Interest rate	2.44%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.48%, 7/11/2019 [Member]
Expiration date	7/11/2019
Interest rate	2.48%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.42%, 7/18/2019 [Member]
Expiration date	7/18/2019
Interest rate	2.42%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.44%, 7/25/2019 [Member]
Expiration date	7/25/2019
Interest rate	2.44%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.46%, 8/08/2019 [Member]
Expiration date	8/08/2019
Interest rate	2.46%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.54%, 8/15/2019 [Member]
Expiration date	8/15/2019
Interest rate	2.54%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.42%, 8/22/2019 [Member]
Expiration date	8/22/2019
Interest rate	2.42%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.48%, 9/05/2019 [Member]
Expiration date	9/05/2019
Interest rate	2.48%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.48%, 9/12/2019 [Member]
Expiration date	9/12/2019
Interest rate	2.48%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.46%, 9/19/2019 [Member]
Expiration date	9/19/2019
Interest rate	2.46%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.41%, 9/26/2019 [Member]
Expiration date	9/26/2019
Interest rate	2.41%