United States Copper Index Fund (CPER) 10-K 28 Feb 19 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)		12 Months Ended
		Dec. 31, 2018	Feb. 26, 2019	Jun. 30, 2018
Document Information [Line Items]
Document Type		10-K
Amendment Flag		false
Document Period End Date		Dec. 31, 2018
Document Fiscal Year Focus		2,018
Document Fiscal Period Focus		FY
Entity Registrant Name		United States Commodity Index Funds Trust
Entity Central Index Key		1,479,247
Current Fiscal Year End Date		--12-31
Entity Well-known Seasoned Issuer		No
Entity Voluntary Filers		No
Entity Current Reporting Status		Yes
Entity Filer Category		Large Accelerated Filer
Trading Symbol		USCI
Entity Shell Company		false
Entity Emerging Growth Company		false
Entity Small Business		false
Entity Public Float				$ 700,502,452
Entity Common Stock, Shares Outstanding			12,450,000
United States Commodity Index Fund [Member]
Document Information [Line Items]
Entity Public Float				688,589,781
Entity Common Stock, Shares Outstanding			11,850,000
United States Copper Index Fund [Member]
Document Information [Line Items]
Entity Public Float				10,289,752
Entity Common Stock, Shares Outstanding			600,000
United States Agriculture Index Fund [Member]
Document Information [Line Items]
Entity Public Float	[1]			$ 1,622,919
Entity Common Stock, Shares Outstanding	[1]		0
[1]	USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.

Statements of Financial Conditi

Statements of Financial Condition - USD ($)		Dec. 31, 2018		Dec. 31, 2017
United States Commodity Index Fund [Member]
Assets
Cash and cash equivalents		$ 427,657,030		$ 393,488,946
Short-Term Investments		0		71,291,769
Equity in trading accounts:
Cash and cash equivalents		50,852,183		32,608,929
Unrealized gain (loss) on open commodity futures contracts		(14,487,984)		6,872,970
Dividends receivable		9,983		0
Interest receivable		4,224		13,598
Directors' fees and insurance receivable		22,319		0
ETF transaction fees receivable		0		350
Total assets		464,057,755		504,276,562
Liabilities and Capital
Payable for shares redeemed		0		2,120,429
Management fees payable (Note 4)		367,646		326,005
Professional fees payable		604,296		539,417
Brokerage commissions payable		43,305		43,305
Directors' fees and insurance payable		0		5,496
Total liabilities		1,015,247		3,034,652
Commitments and Contingencies (Notes 4, 5 and 6)
Capital
Sponsor		0		0
Shareholders		463,042,508		501,241,910
Total Capital		463,042,508		501,241,910
Total liabilities and capital		$ 464,057,755		$ 504,276,562
Shares outstanding		12,350,000		11,800,000
Net asset value per share		$ 37.49		$ 42.48
Market value per share		$ 37.53		$ 42.53
United States Copper Index Fund [Member]
Assets
Cash and cash equivalents		$ 10,753,786		$ 7,124,096
Short-Term Investments		295,216		2,175,807
Equity in trading accounts:
Cash and cash equivalents		1,362,458		798,079
Unrealized gain (loss) on open commodity futures contracts		(903,475)		881,938
Receivable for shares sold		0		2,104,935
Receivable from Sponsor (Note 4)		51,299		40,153
Dividends receivable		1,356		0
Interest receivable		221		1,137
Directors' fees and insurance receivable		0		35
ETF transaction fees receivable		0		350
Total assets		11,560,861		13,126,530
Liabilities and Capital
Payable due to Broker		0		442,429
Management fees payable (Note 4)		6,113		5,282
Professional fees payable		49,800		48,916
Directors' fees and insurance payable		53		0
Total liabilities		55,966		496,627
Commitments and Contingencies (Notes 4, 5 and 6)
Capital
Sponsor		0		0
Shareholders		11,504,895		12,629,903
Total Capital		11,504,895		12,629,903
Total liabilities and capital		$ 11,560,861		$ 13,126,530
Shares outstanding		700,000		600,000
Net asset value per share		$ 16.44		$ 21.05
Market value per share		$ 16.44		$ 21.06
United States Agriculture Index Fund [Member]
Assets
Cash and cash equivalents		$ 0	[1]	$ 1,297,110
Short-Term Investments		0	[1]	296,550
Equity in trading accounts:
Cash and cash equivalents		0	[1]	159,372
Unrealized gain (loss) on open commodity futures contracts		0	[1]	(1,125)
Receivable from Sponsor (Note 4)		0	[1]	45,533
Interest receivable		0	[1]	269
Directors' fees and insurance receivable		0	[1]	183
Total assets		0	[1]	1,797,892
Liabilities and Capital
Management fees payable (Note 4)		0	[1]	2,032
Professional fees payable		0	[1]	44,877
Total liabilities		0	[1]	46,909
Commitments and Contingencies (Notes 4, 5 and 6)
Capital
Sponsor		0	[1]	0
Shareholders		0	[1]	1,750,983
Total Capital		0	[1]	1,750,983
Total liabilities and capital		$ 0	[1]	$ 1,797,892
Shares outstanding		0	[1]	100,000
Net asset value per share	[1]	$ 0		$ 17.51
Market value per share		$ 0	[1]	$ 16.51
USCF Canadian Crude Oil Index Fund [Member]
Assets
Cash and cash equivalents	[2]	$ 0
Equity in trading accounts:
Total assets	[2]	0
Liabilities and Capital
Commitments and Contingencies (Notes 4, 5 and 6)	[2]
Capital
Sponsor	[2]	0
Shareholders	[2]	0
Total Capital	[2]	0
Total liabilities and capital	[2]	0
United States Commodity Index Funds Trust [Member]
Assets
Cash and cash equivalents		438,410,816		$ 401,910,152
Short-Term Investments		295,216		73,764,126
Equity in trading accounts:
Cash and cash equivalents		52,214,641		33,566,380
Unrealized gain (loss) on open commodity futures contracts		(15,391,459)		7,753,783
Receivable for shares sold		0		2,104,935
Receivable from Sponsor (Note 4)		51,299		85,686
Dividends receivable		11,339		0
Interest receivable		4,445		15,004
Directors' fees and insurance receivable		22,319		218
ETF transaction fees receivable		0		700
Total assets		475,618,616		519,200,984
Liabilities and Capital
Payable due to Broker		0		442,429
Payable for shares redeemed		0		2,120,429
Management fees payable (Note 4)		373,759		333,319
Professional fees payable		654,096		633,210
Brokerage commissions payable		43,305		43,305
Directors' fees and insurance payable		53		5,496
Total liabilities		1,071,213		3,578,188
Commitments and Contingencies (Notes 4, 5 and 6)
Capital
Sponsor		0		0
Shareholders		474,547,403		515,622,796
Total Capital		474,547,403		515,622,796
Total liabilities and capital		$ 475,618,616		$ 519,200,984
Shares outstanding		13,050,000		12,500,000
[1]	USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.
[2]	The Sponsor contributed $1,000 on March 31, 2018. UCCO was in registration and had not commenced operations. The Fund filed to withdraw from registration on December 19, 2018.

Statements of Financial Condi_2

Statements of Financial Condition (Parenthetical) - USD ($)	Mar. 31, 2018	Dec. 21, 2009
Sponsor Capital Account	$ 1,000	$ 1,000

Schedule of Investments

Schedule of Investments		Dec. 31, 2018USD ($)Contract		Dec. 31, 2017USD ($)Contract
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member]
Notional Amount		$ 224,163,754		$ 325,375,886
Number of Contracts		3,350		4,905
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ (683,284)		$ 13,592,442
% of Capital		(0.15%)		2.71%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Aluminum Futures LA January 2019 contracts, expiring January 2019 [Member]
Notional Amount		$ 36,377,145
Number of Contracts		754
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ (2,018,308)
% of Capital		(0.44%)
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Tin Futures LT January 2019 contracts, expiring January 2019 [Member]
Notional Amount		$ 42,828,870
Number of Contracts		454
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ 1,504,230
% of Capital		0.33%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Zinc Futures LX January 2019 contracts, expiring January 2019 [Member]
Notional Amount		$ 78,531,955
Number of Contracts		1,261
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ (271,143)
% of Capital		(0.06%)
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Tin Futures LT April 2019 contracts, expiring April 2019 [Member]
Notional Amount		$ 33,478,866
Number of Contracts		345
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ 112,790
% of Capital		0.02%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Zinc Futures LX May 2019 contracts, expiring May 2019 [Member]
Notional Amount		$ 32,946,918
Number of Contracts		536
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ (10,853)
% of Capital	[1]	0.00%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Zinc Futures LX January 2018 contracts, expiring January 2018 [Member]
Notional Amount				$ 35,972,181
Number of Contracts | Contract				446
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 1,213,069
% of Capital				0.24%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Aluminum Futures LA February 2018 contracts, expiring February 2018 [Member]
Notional Amount				$ 41,453,762
Number of Contracts | Contract				840
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 6,148,048
% of Capital				1.23%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | ICE Brent Crude Oil Futures CO April 2018 contracts, expiring February 2018 [Member]
Notional Amount				$ 35,223,750
Number of Contracts | Contract				534
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 255,210
% of Capital				0.05%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Nickel Futures LN April 2018 contracts, expiring April 2018 [Member]
Notional Amount				$ 35,062,350
Number of Contracts | Contract				495
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 2,888,310
% of Capital				0.58%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Lead Futures LL April 2018 contracts, expiring April 2018 [Member]
Notional Amount				$ 35,815,794
Number of Contracts | Contract				598
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 1,402,231
% of Capital				0.28%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Tin Futures LT May 2018 contracts, expiring May 2018 [Member]
Notional Amount				$ 36,803,605
Number of Contracts | Contract				377
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 902,050
% of Capital				0.18%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Lead Futures LL August 2018 contracts, expiring August 2018 [Member]
Notional Amount				$ 35,868,369
Number of Contracts | Contract				567
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (482,358)
% of Capital				(0.10%)
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | LME Zinc Futures LX August 2018 contracts, expiring August 2018 [Member]
Notional Amount				$ 35,569,000
Number of Contracts | Contract				436
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 279,657
% of Capital				0.05%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | ICE Gas Oil Futures QS December 2018 contracts, expiring December 2018 [Member]
Notional Amount				$ 33,607,075
Number of Contracts | Contract				612
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 986,225
% of Capital				0.20%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member]
Notional Amount		$ 408,126,736		$ 318,334,055
Number of Contracts		10,440		8,087
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ (12,621,164)		$ 5,263,653
% of Capital		(2.72%)		1.05%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | NYMEX RBOB Gasoline Futures RB March 2019 contracts, expiring February 2019 [Member]
Notional Amount		$ 32,779,165
Number of Contracts		595
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ 7,715
% of Capital	[1]	0.00%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | ICE Cotton #2 Futures CT March 2019 contracts, expiring March 2019 [Member]
Notional Amount		$ 35,489,270
Number of Contracts		906
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ (2,782,670)
% of Capital		(0.60%)
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CBOT Wheat Futures W March 2019 contracts, expiring March 2019 [Member]
Notional Amount		$ 37,569,250
Number of Contracts		1,305
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ (4,732,188)
% of Capital		(1.02%)
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | ICE Cocoa Futures CC March 2019 contracts, expiring March 2019 [Member]
Notional Amount		$ 30,669,380
Number of Contracts		1,370
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ 2,429,820
% of Capital		0.52%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | COMEX Copper Futures HG March 2019 contracts, expiring March 2019 [Member]
Notional Amount		$ 33,419,850
Number of Contracts		493
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ (992,775)
% of Capital		(0.21%)
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CME Feeder Cattle Futures FC March 2019 contracts, expiring March 2019 [Member]
Notional Amount		$ 33,488,387
Number of Contracts		457
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ 43,988
% of Capital		0.01%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | NYMEX Heating Oil Futures HO April 2019 contracts, expiring March 2019 [Member]
Notional Amount		$ 41,084,917
Number of Contracts		466
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ (8,671,727)
% of Capital		(1.87%)
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | COMEX Gold Futures GC April 2019 contracts, expiring April 2019 [Member]
Notional Amount		$ 33,451,810
Number of Contracts		260
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ 28,390
% of Capital		0.01%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG May 2019 contracts, expiring April 2019 [Member]
Notional Amount		$ 30,921,950
Number of Contracts		1,192
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ 928,290
% of Capital		0.20%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CME Live Cattle Futures FC April 2019 contracts, expiring April 2019 [Member]
Notional Amount		$ 32,451,460
Number of Contracts		664
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ 1,080,540
% of Capital		0.23%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CBOT Soybean Meal Futures SM August 2019 contracts, expiring August 2019 [Member]
Notional Amount		$ 33,445,010
Number of Contracts		1,050
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ (34,010)
% of Capital		(0.01%)
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CBOT Corn Futures C December 2019 contracts, expiring December 2019 [Member]
Notional Amount		$ 33,356,287
Number of Contracts		1,682
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ 73,463
% of Capital		0.02%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CME Live Cattle Futures LC February 2018 contracts, expiring February 2018 [Member]
Notional Amount				$ 35,304,070
Number of Contracts | Contract				726
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (5,950)
% of Capital	[1]			0.00%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | COMEX Copper Futures HG March 2018 contracts, expiring March 2018 [Member]
Notional Amount				$ 33,763,700
Number of Contracts | Contract				430
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 1,716,675
% of Capital				0.34%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG April 2018 contracts, expiring March 2018 [Member]
Notional Amount				$ 36,539,670
Number of Contracts | Contract				1,368
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 1,066,650
% of Capital				0.21%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CME Feeder Cattle Futures FC March 2018 contracts, expiring March 2018 [Member]
Notional Amount				$ 35,426,138
Number of Contracts | Contract				499
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 171,275
% of Capital				0.03%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | LME Aluminum Futures LA April 2018 contracts, expiring April 2018 [Member]
Notional Amount				$ 36,208,836
Number of Contracts | Contract				643
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 315,455
% of Capital				0.06%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | ICE Sugar #11 Futures SB May 2018 contracts, expiring April 2018 [Member]
Notional Amount				$ 36,330,022
Number of Contracts | Contract				2,151
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (145,040)
% of Capital				(0.03%)
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | NYMEX Heating Oil Futures HO June 2018 contracts, expiring May 2018 [Member]
Notional Amount				$ 31,096,531
Number of Contracts | Contract				426
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 4,297,423
% of Capital				0.86%
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CBOT Wheat Futures W July 2018 contracts, expiring July 2018 [Member]
Notional Amount				$ 38,725,288
Number of Contracts | Contract				1,573
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (3,077,175)
% of Capital				(0.61%)
United States Commodity Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | COMEX Gold Futures GC August 2018 contracts, expiring August 2018 [Member]
Notional Amount				$ 34,939,800
Number of Contracts | Contract				271
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 924,340
% of Capital				0.19%
United States Commodity Index Fund [Member] | Open Futures Contracts - Short [Member] | Foreign Contracts [Member]
Notional Amount	[2]	$ (155,781,680)		$ (149,489,806)
Number of Contracts	[2]	2,469		2,394
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[2]	$ (1,183,536)		$ (11,983,125)
% of Capital	[2]	(0.26%)		(2.39%)
United States Commodity Index Fund [Member] | Open Futures Contracts - Short [Member] | Foreign Contracts [Member] | LME Aluminum Futures LA January 2019 contracts, expiring January 2019 [Member]
Notional Amount	[2]	$ (34,664,722)
Number of Contracts	[2]	754
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[2]	$ 301,708
% of Capital	[2]	0.06%
United States Commodity Index Fund [Member] | Open Futures Contracts - Short [Member] | Foreign Contracts [Member] | LME Tin Futures LT January 2019 contracts, expiring January 2019 [Member]
Notional Amount	[2]	$ (41,861,500)
Number of Contracts	[2]	454
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[2]	$ (2,472,323)
% of Capital	[2]	(0.53%)
United States Commodity Index Fund [Member] | Open Futures Contracts - Short [Member] | Foreign Contracts [Member] | LME Zinc Futures LX January 2019 contracts, expiring January 2019 [Member]
Notional Amount	[2]	$ (79,255,458)
Number of Contracts	[2]	1,261
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[2]	$ 987,079
% of Capital	[2]	0.21%
United States Commodity Index Fund [Member] | Open Futures Contracts - Short [Member] | Foreign Contracts [Member] | LME Zinc Futures LX January 2018 contracts, expiring January 2018 [Member]
Notional Amount	[2]			$ (36,749,919)
Number of Contracts | Contract	[2]			446
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[2]			$ (438,284)
% of Capital	[2]			(0.09%)
United States Commodity Index Fund [Member] | Open Futures Contracts - Short [Member] | Foreign Contracts [Member] | LME Aluminum Futures LA February 2018 contracts, expiring February 2018 [Member]
Notional Amount	[2]			$ (43,373,100)
Number of Contracts | Contract	[2]			840
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[2]			$ (4,234,182)
% of Capital	[2]			(0.84%)
United States Commodity Index Fund [Member] | Open Futures Contracts - Short [Member] | Foreign Contracts [Member] | LME Nickel Futures LN April 2018 contracts, expiring April 2018 [Member]
Notional Amount	[2]			$ (31,247,256)
Number of Contracts | Contract	[2]			495
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[2]			$ (6,706,684)
% of Capital	[2]			(1.34%)
United States Commodity Index Fund [Member] | Open Futures Contracts - Short [Member] | Foreign Contracts [Member] | LME Lead Futures LL April 2018 contracts, expiring April 2018 [Member]
Notional Amount	[2]			$ (36,661,056)
Number of Contracts | Contract	[2]			598
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[2]			$ (560,927)
% of Capital	[2]			(0.11%)
United States Commodity Index Fund [Member] | Open Futures Contracts - Short [Member] | Foreign Contracts [Member] | LME Tin Futures LT May 2018 contracts, expiring May 2018 [Member]
Notional Amount	[2]			$ (1,458,475)
Number of Contracts | Contract	[2]			15
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[2]			$ (43,048)
% of Capital	[2]			(0.01%)
United States Commodity Index Fund [Member] | Short-term Investments [Member]
Market Value				$ 71,291,769
% of Capital				14.22%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member]
Market Value				$ 71,291,769
% of Capital				14.22%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.35%, 7/19/2018 [Member]
Principal Amount				$ 15,000,000
Market Value				$ 14,889,527
% of Capital				2.97%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.21%, 8/16/2018 [Member]
Principal Amount				$ 16,000,000
Market Value				$ 15,879,280
% of Capital				3.17%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.32%, 9/13/2018 [Member]
Principal Amount				$ 12,000,000
Market Value				$ 11,889,358
% of Capital				2.37%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.40%, 10/11/2018 [Member]
Principal Amount				$ 15,000,000
Market Value				$ 14,837,491
% of Capital				2.96%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.54%, 11/08/2018 [Member]
Principal Amount				$ 6,000,000
Market Value				$ 5,921,213
% of Capital				1.18%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.69%, 12/06/2018 [Member]
Principal Amount				$ 8,000,000
Market Value				$ 7,874,900
% of Capital				1.57%
United States Commodity Index Fund [Member] | Open Futures Contracts [Member]
Notional Amount		$ 476,508,810	[3]	$ 494,220,135	[4]
Number of Contracts		16,259	[3]	15,386	[4]
Value/Unrealized Gain (Loss) on Open Commodity Contracts		$ (14,487,984)	[3]	$ 6,872,970	[4]
% of Capital		(3.13%)	[3]	1.37%	[4]
United States Commodity Index Fund [Member] | Cash Equivalents [Member]
Market Value		$ 436,426,995		$ 370,694,809
% of Capital		94.25%		73.96%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]
Market Value		$ 430,026,995		$ 361,694,809
% of Capital		92.87%		72.16%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.07%, 1/03/2019 [Member]
Principal Amount		$ 15,000,000
Market Value		$ 14,998,296
% of Capital		3.24%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.16%, 1/10/2019 [Member]
Principal Amount		$ 40,000,000
Market Value		$ 39,978,587
% of Capital		8.63%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.18%, 1/17/2019 [Member]
Principal Amount		$ 15,000,000
Market Value		$ 14,985,567
% of Capital		3.24%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.22%, 1/24/2019 [Member]
Principal Amount		$ 8,000,000
Market Value		$ 7,988,730
% of Capital		1.72%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.22%, 1/31/2019 [Member]
Principal Amount		$ 37,000,000
Market Value		$ 36,932,187
% of Capital		7.98%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.25%, 2/07/2019 [Member]
Principal Amount		$ 23,000,000
Market Value		$ 22,947,285
% of Capital		4.96%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.28%, 2/14/2019 [Member]
Principal Amount		$ 54,000,000
Market Value		$ 53,850,510
% of Capital		11.63%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.29%, 2/21/2019 [Member]
Principal Amount		$ 20,000,000
Market Value		$ 19,935,768
% of Capital		4.30%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.10%, 2/28/2019 [Member]
Principal Amount		$ 7,000,000
Market Value		$ 6,976,703
% of Capital		1.51%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.34%, 3/07/2019 [Member]
Principal Amount		$ 57,000,000
Market Value		$ 56,761,748
% of Capital		12.26%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.12%, 3/28/2019 [Member]
Principal Amount		$ 10,000,000
Market Value		$ 9,950,431
% of Capital		2.15%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.41%, 04/04/2019 [Member]
Principal Amount		$ 16,000,000
Market Value		$ 15,901,317
% of Capital		3.43%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.43%, 4/11/2019 [Member]
Principal Amount		$ 30,000,000
Market Value		$ 29,799,167
% of Capital		6.43%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.22%, 4/25/2019 [Member]
Principal Amount		$ 4,000,000
Market Value		$ 3,972,450
% of Capital		0.86%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.46%, 5/02/2019 [Member]
Principal Amount		$ 23,000,000
Market Value		$ 22,812,534
% of Capital		4.93%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.47%, 5/09/2019 [Member]
Principal Amount		$ 2,000,000
Market Value		$ 1,982,684
% of Capital		0.43%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.43%, 5/23/2019 [Member]
Principal Amount		$ 40,000,000
Market Value		$ 39,619,756
% of Capital		8.56%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.51%, 6/06/2019 [Member]
Principal Amount		$ 6,000,000
Market Value		$ 5,935,650
% of Capital		1.28%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.49%, 6/27/2019 [Member]
Principal Amount		$ 25,000,000
Market Value		$ 24,697,625
% of Capital		5.33%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 1/04/2018 [Member]
Principal Amount				$ 30,000,000
Market Value				$ 29,997,213
% of Capital				5.98%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.11%, 1/11/2018 [Member]
Principal Amount				$ 5,000,000
Market Value				$ 4,998,465
% of Capital				1.00%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.10%, 1/18/2018 [Member]
Principal Amount				$ 10,000,000
Market Value				$ 9,994,853
% of Capital				1.99%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 1/25/2018 [Member]
Principal Amount				$ 25,000,000
Market Value				$ 24,981,417
% of Capital				4.98%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.83%, 2/01/2018 [Member]
Principal Amount				$ 10,000,000
Market Value				$ 9,992,896
% of Capital				1.99%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 2/15/2018 [Member]
Principal Amount				$ 5,000,000
Market Value				$ 4,993,063
% of Capital				1.00%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.06%, 3/01/2018 [Member]
Principal Amount				$ 12,000,000
Market Value				$ 11,979,399
% of Capital				2.39%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.14%, 3/08/2018 [Member]
Principal Amount				$ 12,000,000
Market Value				$ 11,975,085
% of Capital				2.39%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.16%, 3/22/2018 [Member]
Principal Amount				$ 10,000,000
Market Value				$ 9,974,444
% of Capital				1.99%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.07%, 3/29/2018 [Member]
Principal Amount				$ 15,000,000
Market Value				$ 14,961,672
% of Capital				2.99%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.19%, 4/05/2018 [Member]
Principal Amount				$ 4,000,000
Market Value				$ 3,987,623
% of Capital				0.80%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.22%, 4/12/2018 [Member]
Principal Amount				$ 10,000,000
Market Value				$ 9,965,913
% of Capital				1.99%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.23%, 4/19/2018 [Member]
Principal Amount				$ 15,000,000
Market Value				$ 14,945,212
% of Capital				2.98%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.16%, 4/26/2018 [Member]
Principal Amount				$ 40,000,000
Market Value				$ 39,853,135
% of Capital				7.95%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.27%, 5/03/2018 [Member]
Principal Amount				$ 20,000,000
Market Value				$ 19,914,600
% of Capital				3.97%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.32%, 5/10/2018 [Member]
Principal Amount				$ 20,000,000
Market Value				$ 19,906,117
% of Capital				3.97%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.37%, 5/17/2018 [Member]
Principal Amount				$ 10,000,000
Market Value				$ 9,948,717
% of Capital				1.99%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.27%, 5/24/2018 [Member]
Principal Amount				$ 25,000,000
Market Value				$ 24,875,074
% of Capital				4.96%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 5/31/2018 [Member]
Principal Amount				$ 20,000,000
Market Value				$ 19,881,667
% of Capital				3.97%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 6/07/2018 [Member]
Principal Amount				$ 10,000,000
Market Value				$ 9,938,072
% of Capital				1.98%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.46%, 6/14/2018 [Member]
Principal Amount				$ 10,000,000
Market Value				$ 9,934,172
% of Capital				1.98%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.27%, 6/21/2018 [Member]
Principal Amount				$ 20,000,000
Market Value				$ 19,880,181
% of Capital				3.97%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.50%, 6/28/2018 [Member]
Principal Amount				$ 25,000,000
Market Value				$ 24,815,819
% of Capital				4.95%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member]
Market Value		$ 6,400,000		$ 9,000,000
% of Capital		1.38%		1.80%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]
Principal Amount		$ 2,200,000		$ 3,000,000
Market Value		$ 2,200,000		$ 3,000,000
% of Capital		0.47%		0.60%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]
Principal Amount		$ 550,000		$ 3,000,000
Market Value		$ 550,000		$ 3,000,000
% of Capital		0.12%		0.60%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]
Principal Amount		$ 3,650,000		$ 3,000,000
Market Value		$ 3,650,000		$ 3,000,000
% of Capital		0.79%		0.60%
United States Copper Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | COMEX Copper Futures HG March 2019 contracts, expiring March 2019 [Member]
Notional Amount	[5]	$ 12,348,325
Number of Contracts | Contract	[5]	174
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[5]	$ (903,475)
% of Capital	[5]	(7.85%)
United States Copper Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | COMEX Copper Futures HG May 2018 contracts, expiring May 2018 [Member]
Notional Amount	[6]			$ 11,797,938
Number of Contracts | Contract	[6]			153
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[6]			$ 881,938
% of Capital	[6]			6.98%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member]
Market Value				$ 2,175,807
% of Capital				17.22%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.59%, 8/15/2019 [Member]
Principal Amount		$ 300,000
Market Value		$ 295,216
% of Capital		2.57%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.36%, 7/19/2018 [Member]
Principal Amount				$ 400,000
Market Value				$ 397,016
% of Capital				3.14%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.44%, 8/16/2018 [Member]
Principal Amount				$ 400,000
Market Value				$ 396,419
% of Capital				3.14%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.32%, 9/13/2018 [Member]
Principal Amount				$ 300,000
Market Value				$ 297,230
% of Capital				2.35%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.39%, 10/11/2018 [Member]
Principal Amount				$ 300,000
Market Value				$ 296,771
% of Capital				2.35%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.58%, 11/08/2018 [Member]
Principal Amount				$ 400,000
Market Value				$ 394,614
% of Capital				3.12%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.68%, 12/06/2018 [Member]
Principal Amount				$ 400,000
Market Value				$ 393,757
% of Capital				3.12%
United States Copper Index Fund [Member] | Cash Equivalents [Member]
Market Value		$ 9,362,210		$ 7,414,260
% of Capital		81.38%		58.71%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]
Market Value		$ 8,507,210		$ 6,424,260
% of Capital		73.95%		50.88%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.76%, 1/03/2019 [Member]
Principal Amount		$ 300,000
Market Value		$ 299,971
% of Capital		2.61%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.11%, 1/10/2019 [Member]
Principal Amount		$ 700,000
Market Value		$ 699,634
% of Capital		6.08%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.13%, 1/17/2019 [Member]
Principal Amount		$ 500,000
Market Value		$ 499,531
% of Capital		4.34%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.15%, 1/24/2019 [Member]
Principal Amount		$ 700,000
Market Value		$ 699,050
% of Capital		6.08%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.14%, 1/31/2019 [Member]
Principal Amount		$ 200,000
Market Value		$ 199,647
% of Capital		1.74%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.25%, 2/07/2019 [Member]
Principal Amount		$ 400,000
Market Value		$ 399,083
% of Capital		3.47%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.24%, 2/14/2019 [Member]
Principal Amount		$ 300,000
Market Value		$ 299,185
% of Capital		2.60%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.29%, 2/21/2019 [Member]
Principal Amount		$ 350,000
Market Value		$ 348,872
% of Capital		3.03%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.01%, 2/28/2019 [Member]
Principal Amount		$ 100,000
Market Value		$ 99,682
% of Capital		0.87%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.34%, 3/07/2019 [Member]
Principal Amount		$ 350,000
Market Value		$ 348,537
% of Capital		3.03%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.35%, 3/21/2019 [Member]
Principal Amount		$ 400,000
Market Value		$ 397,946
% of Capital		3.46%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.19%, 3/28/2019 [Member]
Principal Amount		$ 500,000
Market Value		$ 497,432
% of Capital		4.32%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.40%, 4/04/2019 [Member]
Principal Amount		$ 500,000
Market Value		$ 496,931
% of Capital		4.32%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.43%, 4/11/2019 [Member]
Principal Amount		$ 500,000
Market Value		$ 496,660
% of Capital		4.32%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.44%, 4/18/2019 [Member]
Principal Amount		$ 500,000
Market Value		$ 496,404
% of Capital		4.31%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.36%, 4/25/2019 [Member]
Principal Amount		$ 450,000
Market Value		$ 446,688
% of Capital		3.88%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.46%, 5/02/2019 [Member]
Principal Amount		$ 100,000
Market Value		$ 99,185
% of Capital		0.86%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.47%, 5/09/2019 [Member]
Principal Amount		$ 500,000
Market Value		$ 495,671
% of Capital		4.31%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.45%, 5/23/2019 [Member]
Principal Amount		$ 600,000
Market Value		$ 594,262
% of Capital		5.17%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.49%, 6/20/2019 [Member]
Principal Amount		$ 200,000
Market Value		$ 197,677
% of Capital		1.72%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.49%, 6/27/2019 [Member]
Principal Amount		$ 400,000
Market Value		$ 395,162
% of Capital		3.43%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.92%, 1/04/2018 [Member]
Principal Amount				$ 250,000
Market Value				$ 249,981
% of Capital				1.98%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 1/25/2018 [Member]
Principal Amount				$ 100,000
Market Value				$ 99,926
% of Capital				0.79%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.82%, 2/01/2018 [Member]
Principal Amount				$ 200,000
Market Value				$ 199,860
% of Capital				1.58%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.13%, 2/08/2018 [Member]
Principal Amount				$ 100,000
Market Value				$ 99,881
% of Capital				0.79%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 2/15/2018 [Member]
Principal Amount				$ 250,000
Market Value				$ 249,653
% of Capital				1.98%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.02%, 3/01/2018 [Member]
Principal Amount				$ 500,000
Market Value				$ 499,174
% of Capital				3.95%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.14%, 3/15/2018 [Member]
Principal Amount				$ 300,000
Market Value				$ 299,313
% of Capital				2.37%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.16%, 3/22/2018 [Member]
Principal Amount				$ 500,000
Market Value				$ 498,722
% of Capital				3.95%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.02%, 3/29/2018 [Member]
Principal Amount				$ 250,000
Market Value				$ 249,390
% of Capital				1.98%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.19%, 4/05/2018 [Member]
Principal Amount				$ 200,000
Market Value				$ 199,381
% of Capital				1.58%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.22%, 4/12/2018 [Member]
Principal Amount				$ 200,000
Market Value				$ 199,318
% of Capital				1.58%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.23%, 4/19/2018 [Member]
Principal Amount				$ 300,000
Market Value				$ 298,904
% of Capital				2.37%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.15%, 4/26/2018 [Member]
Principal Amount				$ 400,000
Market Value				$ 398,540
% of Capital				3.16%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.27%, 5/03/2018 [Member]
Principal Amount				$ 100,000
Market Value				$ 99,573
% of Capital				0.79%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.37%, 5/17/2018 [Member]
Principal Amount				$ 500,000
Market Value				$ 497,436
% of Capital				3.94%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.28%, 5/24/2018 [Member]
Principal Amount				$ 300,000
Market Value				$ 298,485
% of Capital				2.36%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 5/31/2018 [Member]
Principal Amount				$ 300,000
Market Value				$ 298,225
% of Capital				2.36%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 6/07/2018 [Member]
Principal Amount				$ 300,000
Market Value				$ 298,142
% of Capital				2.36%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.46%, 6/14/2018 [Member]
Principal Amount				$ 500,000
Market Value				$ 496,709
% of Capital				3.93%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.42%, 6/21/2018 [Member]
Principal Amount				$ 400,000
Market Value				$ 397,331
% of Capital				3.15%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.50%, 6/28/2018 [Member]
Principal Amount				$ 500,000
Market Value				$ 496,316
% of Capital				3.93%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member]
Market Value		$ 855,000		$ 990,000
% of Capital		7.43%		7.83%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]
Principal Amount				$ 330,000
Market Value				$ 330,000
% of Capital				2.61%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]
Principal Amount		$ 620,000		$ 330,000
Market Value		$ 620,000		$ 330,000
% of Capital		5.39%		2.61%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]
Principal Amount		$ 235,000		$ 330,000
Market Value		$ 235,000		$ 330,000
% of Capital		2.04%		2.61%
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | Foreign Contracts [Member] | ICE-Canola Futures RS March 2018 contracts, expiring March 2018 [Member]
Notional Amount				$ 87,058
Number of Contracts | Contract				11
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (1,314)
% of Capital				(0.07%)
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member]
Notional Amount				$ 1,665,403
Number of Contracts | Contract				59
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 189
% of Capital				0.01%
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CME Live Cattle Futures LC February 2018 contracts, expiring February 2018 [Member]
Notional Amount				$ 192,810
Number of Contracts | Contract				4
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 1,670
% of Capital				0.10%
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | ICE Cotton #2 Futures CT March 2018 contracts, expiring March 2018 [Member]
Notional Amount				$ 136,540
Number of Contracts | Contract				4
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 20,720
% of Capital				1.18%
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CBOT Wheat Futures W March 2018 contracts, expiring March 2018 [Member]
Notional Amount				$ 182,513
Number of Contracts | Contract				8
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (11,713)
% of Capital				(0.67%)
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | ICE Cocoa Futures CC March 2018 contracts, expiring March 2018 [Member]
Notional Amount				$ 80,070
Number of Contracts | Contract				4
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (4,390)
% of Capital				(0.25%)
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | KCBT Hard Red Winter Wheat Futures KW March 2018 contracts, expiring March 2018 [Member]
Notional Amount				$ 43,112
Number of Contracts | Contract				2
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (387)
% of Capital				(0.02%)
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CME Feeder Cattle Futures FC March 2018 contracts, expiring March 2018 [Member]
Notional Amount				$ 71,125
Number of Contracts | Contract				1
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 213
% of Capital				0.01%
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CME Lean Hogs Futures LH April 2018 contracts, expiring April 2018 [Member]
Notional Amount				$ 149,360
Number of Contracts | Contract				5
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 1,940
% of Capital				0.11%
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | ICE Sugar #11 Futures SB May 2018 contracts, expiring April 2018 [Member]
Notional Amount				$ 198,005
Number of Contracts | Contract				12
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ 3,864
% of Capital				0.22%
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CBOT Soybean Meal Futures SM July 2018 contracts, expiring July 2018 [Member]
Notional Amount				$ 67,160
Number of Contracts | Contract				2
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (2,460)
% of Capital				(0.14%)
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CBOT Soybean Oil Futures BO July 2018 contracts, expiring July 2018 [Member]
Notional Amount				$ 21,252
Number of Contracts | Contract				1
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (1,080)
% of Capital				(0.06%)
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | ICE Coffee-C Futures KC July 2018 contracts, expiring July 2018 [Member]
Notional Amount				$ 149,756
Number of Contracts | Contract				3
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (2,438)
% of Capital				(0.14%)
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CBOT Soybean Futures S November 2018 contracts, expiring November 2018 [Member]
Notional Amount				$ 196,988
Number of Contracts | Contract				4
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (1,838)
% of Capital				(0.11%)
United States Agriculture Index Fund [Member] | Open Futures Contracts – Long [Member] | United States Contracts [Member] | CBOT Corn Futures C December 2018 contracts, expiring December 2018 [Member]
Notional Amount				$ 176,712
Number of Contracts | Contract				9
Value/Unrealized Gain (Loss) on Open Commodity Contracts				$ (3,912)
% of Capital				(0.22%)
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member]
Market Value				$ 296,550
% of Capital				16.94%
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.33%, 7/19/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,635
% of Capital				2.83%
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.44%, 8/16/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,551
% of Capital				2.83%
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.51%, 9/13/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,471
% of Capital				2.83%
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.67%, 10/11/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,353
% of Capital				2.82%
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.58%, 11/08/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,326
% of Capital				2.82%
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.70%, 12/06/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,214
% of Capital				2.81%
United States Agriculture Index Fund [Member] | Open Futures Contracts [Member]
Notional Amount	[7]			$ 1,752,461
Number of Contracts | Contract	[7]			70
Value/Unrealized Gain (Loss) on Open Commodity Contracts	[7]			$ (1,125)
% of Capital	[7]			(0.06%)
United States Agriculture Index Fund [Member] | Cash Equivalents [Member]
Market Value				$ 1,347,209
% of Capital				76.94%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member]
Market Value				$ 1,047,209
% of Capital				59.81%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 1/04/2018 [Member]
Principal Amount				$ 100,000
Market Value				$ 99,991
% of Capital				5.71%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.11%, 1/11/2018 [Member]
Principal Amount				$ 100,000
Market Value				$ 99,969
% of Capital				5.71%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 2/01/2018 [Member]
Principal Amount				$ 100,000
Market Value				$ 99,904
% of Capital				5.71%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 2/15/2018 [Member]
Principal Amount				$ 250,000
Market Value				$ 249,653
% of Capital				14.26%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.14%, 3/08/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,896
% of Capital				2.85%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.16%, 3/22/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,872
% of Capital				2.85%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.19%, 4/05/2018 [Member]
Principal Amount				$ 100,000
Market Value				$ 99,691
% of Capital				5.69%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.27%, 5/03/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,786
% of Capital				2.84%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.37%, 5/17/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,744
% of Capital				2.84%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 5/24/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,719
% of Capital				2.84%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 5/31/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,704
% of Capital				2.84%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.49%, 6/21/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,648
% of Capital				2.84%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.50%, 6/28/2018 [Member]
Principal Amount				$ 50,000
Market Value				$ 49,632
% of Capital				2.83%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member]
Market Value				$ 300,000
% of Capital				17.13%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]
Principal Amount				$ 100,000
Market Value				$ 100,000
% of Capital				5.71%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]
Principal Amount				$ 100,000
Market Value				$ 100,000
% of Capital				5.71%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States - Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]
Principal Amount				$ 100,000
Market Value				$ 100,000
% of Capital				5.71%
[1]	Represents less than 0.005%.
[2]	All short contracts are offset by long positions in 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).
[3]	Collateral amounted to $50,852,183 on open futures contracts.
[4]	Collateral amounted to $32,608,929 on open futures contracts.
[5]	Collateral amounted to $1,362,458 on open futures contracts.
[6]	Collateral amounted to $798,079 on open futures contracts.
[7]	Collateral amounted to $159,372 on open futures contracts.

Schedule of Investments (Parent

Schedule of Investments (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
United States Commodity Index Fund [Member]
Debt Instrument, Collateral Amount	$ 50,852,183	$ 32,608,929
Interest rate	0.005%	0.005%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.35%, 7/19/2018 [Member]
Expiration date		7/19/2018
Interest rate		1.35%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.21%, 8/16/2018 [Member]
Expiration date		8/16/2018
Interest rate		1.21%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.32%, 9/13/2018 [Member]
Expiration date		9/13/2018
Interest rate		1.32%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.40%, 10/11/2018 [Member]
Expiration date		10/11/2018
Interest rate		1.40%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.54%, 11/08/2018 [Member]
Expiration date		11/08/2018
Interest rate		1.54%
United States Commodity Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.69%, 12/06/2018 [Member]
Expiration date		12/06/2018
Interest rate		1.69%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.07%, 1/03/2019 [Member]
Expiration date	1/03/2019
Interest rate	2.07%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.16%, 1/10/2019 [Member]
Expiration date	1/10/2019
Interest rate	2.16%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.18%, 1/17/2019 [Member]
Expiration date	1/17/2019
Interest rate	2.18%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.22%, 1/24/2019 [Member]
Expiration date	1/24/2019
Interest rate	2.22%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.22%, 1/31/2019 [Member]
Expiration date	1/31/2019
Interest rate	2.22%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.25%, 2/07/2019 [Member]
Expiration date	2/07/2019
Interest rate	2.25%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.28%, 2/14/2019 [Member]
Expiration date	2/14/2019
Interest rate	2.28%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.29%, 2/21/2019 [Member]
Expiration date	2/21/2019
Interest rate	2.29%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.10%, 2/28/2019 [Member]
Expiration date	2/28/2019
Interest rate	2.10%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.34%, 3/07/2019 [Member]
Expiration date	3/07/2019
Interest rate	2.34%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.12%, 3/28/2019 [Member]
Expiration date	3/28/2019
Interest rate	2.12%
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 2.22%, 4/25/2019 [Member]
Expiration date	4/25/2019
Interest rate	2.22%
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 2.47%, 5/09/2019 [Member]
Expiration date	5/09/2019
Interest rate	2.47%
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 2.51%, 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 2.49%, 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 1.12%, 1/04/2018 [Member]
Expiration date		1/04/2018
Interest rate		1.12%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.11%, 1/11/2018 [Member]
Expiration date		1/11/2018
Interest rate		1.11%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.10%, 1/18/2018 [Member]
Expiration date		1/18/2018
Interest rate		1.10%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 1/25/2018 [Member]
Expiration date		1/25/2018
Interest rate		1.12%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.83%, 2/01/2018 [Member]
Expiration date		2/01/2018
Interest rate		0.83%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 2/15/2018 [Member]
Expiration date		2/15/2018
Interest rate		1.12%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.06%, 3/01/2018 [Member]
Expiration date		3/01/2018
Interest rate		1.06%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.14%, 3/08/2018 [Member]
Expiration date		3/08/2018
Interest rate		1.14%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.16%, 3/22/2018 [Member]
Expiration date		3/22/2018
Interest rate		1.16%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.07%, 3/29/2018 [Member]
Expiration date		3/29/2018
Interest rate		1.07%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.19%, 4/05/2018 [Member]
Expiration date		4/05/2018
Interest rate		1.19%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.22%, 4/12/2018 [Member]
Expiration date		4/12/2018
Interest rate		1.22%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.23%, 4/19/2018 [Member]
Expiration date		4/19/2018
Interest rate		1.23%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.16%, 4/26/2018 [Member]
Expiration date		4/26/2018
Interest rate		1.16%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.27%, 5/03/2018 [Member]
Expiration date		5/03/2018
Interest rate		1.27%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.32%, 5/10/2018 [Member]
Expiration date		5/10/2018
Interest rate		1.32%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.37%, 5/17/2018 [Member]
Expiration date		5/17/2018
Interest rate		1.37%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.27%, 5/24/2018 [Member]
Expiration date		5/24/2018
Interest rate		1.27%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 5/31/2018 [Member]
Expiration date		5/31/2018
Interest rate		1.43%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 6/07/2018 [Member]
Expiration date		6/07/2018
Interest rate		1.43%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.46%, 6/14/2018 [Member]
Expiration date		6/14/2018
Interest rate		1.46%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.27%, 6/21/2018 [Member]
Expiration date		6/21/2018
Interest rate		1.27%
United States Commodity Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.50%, 6/28/2018 [Member]
Expiration date		6/28/2018
Interest rate		1.50%
United States Copper Index Fund [Member]
Debt Instrument, Collateral Amount	$ 1,362,458	$ 798,079
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.59%, 8/15/2019 [Member]
Expiration date	8/15/2019
Interest rate	2.59%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.36%, 7/19/2018 [Member]
Expiration date		7/19/2018
Interest rate		1.36%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.44%, 8/16/2018 [Member]
Expiration date		8/16/2018
Interest rate		1.44%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.32%, 9/13/2018 [Member]
Expiration date		9/13/2018
Interest rate		1.32%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.39%, 10/11/2018 [Member]
Expiration date		10/11/2018
Interest rate		1.39%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.58%, 11/08/2018 [Member]
Expiration date		11/08/2018
Interest rate		1.58%
United States Copper Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.68%, 12/06/2018 [Member]
Expiration date		12/06/2018
Interest rate		1.68%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.76%, 1/03/2019 [Member]
Expiration date	1/03/2019
Interest rate	1.76%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.11%, 1/10/2019 [Member]
Expiration date	1/10/2019
Interest rate	2.11%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.13%, 1/17/2019 [Member]
Expiration date	1/17/2019
Interest rate	2.13%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.15%, 1/24/2019 [Member]
Expiration date	1/24/2019
Interest rate	2.15%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.14%, 1/31/2019 [Member]
Expiration date	1/31/2019
Interest rate	2.14%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.25%, 2/07/2019 [Member]
Expiration date	2/07/2019
Interest rate	2.25%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.24%, 2/14/2019 [Member]
Expiration date	2/14/2019
Interest rate	2.24%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.29%, 2/21/2019 [Member]
Expiration date	2/21/2019
Interest rate	2.29%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.01%, 2/28/2019 [Member]
Expiration date	2/28/2019
Interest rate	2.01%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.34%, 3/07/2019 [Member]
Expiration date	3/07/2019
Interest rate	2.34%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.35%, 3/21/2019 [Member]
Expiration date	3/21/2019
Interest rate	2.35%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 2.19%, 3/28/2019 [Member]
Expiration date	3/28/2019
Interest rate	2.19%
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 2.46%, 5/02/2019 [Member]
Expiration date	5/02/2019
Interest rate	2.46%
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 2.45%, 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 2.49%, 6/20/2019 [Member]
Expiration date	6/20/2019
Interest rate	2.49%
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 0.92%, 1/04/2018 [Member]
Expiration date		1/04/2018
Interest rate		0.92%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 1/25/2018 [Member]
Expiration date		1/25/2018
Interest rate		1.12%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 0.82%, 2/01/2018 [Member]
Expiration date		2/01/2018
Interest rate		0.82%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.13%, 2/08/2018 [Member]
Expiration date		2/08/2018
Interest rate		1.13%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 2/15/2018 [Member]
Expiration date		2/15/2018
Interest rate		1.12%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.02%, 3/01/2018 [Member]
Expiration date		3/01/2018
Interest rate		1.02%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.14%, 3/15/2018 [Member]
Expiration date		3/15/2018
Interest rate		1.14%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.16%, 3/22/2018 [Member]
Expiration date		3/22/2018
Interest rate		1.16%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.02%, 3/29/2018 [Member]
Expiration date		3/29/2018
Interest rate		1.02%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.19%, 4/05/2018 [Member]
Expiration date		4/05/2018
Interest rate		1.19%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.22%, 4/12/2018 [Member]
Expiration date		4/12/2018
Interest rate		1.22%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.23%, 4/19/2018 [Member]
Expiration date		4/19/2018
Interest rate		1.23%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.15%, 4/26/2018 [Member]
Expiration date		4/26/2018
Interest rate		1.15%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.27%, 5/03/2018 [Member]
Expiration date		5/03/2018
Interest rate		1.27%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.37%, 5/17/2018 [Member]
Expiration date		5/17/2018
Interest rate		1.37%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.28%, 5/24/2018 [Member]
Expiration date		5/24/2018
Interest rate		1.28%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 5/31/2018 [Member]
Expiration date		5/31/2018
Interest rate		1.43%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 6/07/2018 [Member]
Expiration date		6/07/2018
Interest rate		1.43%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.46%, 6/14/2018 [Member]
Expiration date		6/14/2018
Interest rate		1.46%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.42%, 6/21/2018 [Member]
Expiration date		6/21/2018
Interest rate		1.42%
United States Copper Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.50%, 6/28/2018 [Member]
Expiration date		6/28/2018
Interest rate		1.50%
United States Agriculture Index Fund [Member]
Debt Instrument, Collateral Amount		$ 159,372
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.33%, 7/19/2018 [Member]
Expiration date		7/19/2018
Interest rate		1.33%
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.44%, 8/16/2018 [Member]
Expiration date		8/16/2018
Interest rate		1.44%
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.51%, 9/13/2018 [Member]
Expiration date		9/13/2018
Interest rate		1.51%
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.67%, 10/11/2018 [Member]
Expiration date		10/11/2018
Interest rate		1.67%
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.58%, 11/08/2018 [Member]
Expiration date		11/08/2018
Interest rate		1.58%
United States Agriculture Index Fund [Member] | Short-term Investments [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.70%, 12/06/2018 [Member]
Expiration date		12/06/2018
Interest rate		1.70%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 1/04/2018 [Member]
Expiration date		1/04/2018
Interest rate		1.12%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.11%, 1/11/2018 [Member]
Expiration date		1/11/2018
Interest rate		1.11%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 2/01/2018 [Member]
Expiration date		2/01/2018
Interest rate		1.12%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.12%, 2/15/2018 [Member]
Expiration date		2/15/2018
Interest rate		1.12%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.14%, 3/08/2018 [Member]
Expiration date		3/08/2018
Interest rate		1.14%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.16%, 3/22/2018 [Member]
Expiration date		3/22/2018
Interest rate		1.16%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.19%, 4/05/2018 [Member]
Expiration date		4/05/2018
Interest rate		1.19%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.27%, 5/03/2018 [Member]
Expiration date		5/03/2018
Interest rate		1.27%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.37%, 5/17/2018 [Member]
Expiration date		5/17/2018
Interest rate		1.37%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 5/24/2018 [Member]
Expiration date		5/24/2018
Interest rate		1.43%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.43%, 5/31/2018 [Member]
Expiration date		5/31/2018
Interest rate		1.43%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.49%, 6/21/2018 [Member]
Expiration date		6/21/2018
Interest rate		1.49%
United States Agriculture Index Fund [Member] | Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills 1.50%, 6/28/2018 [Member]
Expiration date		6/28/2018
Interest rate		1.50%

Statements of Operations

Statements of Operations - USD ($)		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
United States Commodity Index Fund [Member]
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions		$ (54,710,680)		$ 22,989,718	$ (22,063,913)
Change in unrealized gain (loss) on open positions		(21,360,954)		4,817,510	10,637,687
Dividend income		409,565		0	0
Interest income	[1]	9,827,503		4,017,753	1,984,573
ETF transaction fees		26,600		15,750	17,500
Total income (loss)		(65,807,966)		31,840,731	(9,424,153)
Expenses
Management fees (Note 4)		4,645,618		4,126,513	4,810,916
Professional fees		685,742		626,130	553,904
Brokerage commissions		539,884		527,610	776,649
Directors' fees and insurance		91,761		69,558	74,029
Total expenses		5,963,005		5,349,811	6,215,498
Net income (loss)		$ (71,770,971)		$ 26,490,920	$ (15,639,651)
Net income (loss) per share (in dollars per share)		$ (4.99)		$ 2.46	$ (0.50)
Net income (loss) per weighted average share (in dollars per share)		$ (5.21)		$ 2.04	$ (1.07)
Weighted average shares outstanding (in shares)		13,764,384		12,996,575	14,559,973
United States Copper Index Fund [Member]
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions		$ (1,318,188)		$ 1,468,825	$ (19,600)
Change in unrealized gain (loss) on open positions		(1,785,413)		793,363	269,200
Realized gain (loss) on short-term investments		0		(23)	0
Dividend income		13,343		0	0
Interest income	[1]	187,804		80,677	9,625
ETF transaction fees		4,550		4,550	1,400
Total income (loss)		(2,897,904)		2,347,392	260,625
Expenses
Management fees (Note 4)		76,916		67,217	19,170
Professional fees		61,767		48,451	78,043
Brokerage commissions		5,181		5,461	1,628
Directors' fees and insurance		2,100		1,823	392
Total expenses		145,964		122,952	99,233
Expense waiver (Note 4)		(51,300)		(40,153)	(75,640)
Net expenses		94,664		82,799	23,593
Net income (loss)		$ (2,992,568)		$ 2,264,593	$ 237,032
Net income (loss) per share (in dollars per share)		$ (4.61)		$ 4.69	$ 2.12
Net income (loss) per weighted average share (in dollars per share)		$ (4.70)		$ 3.92	$ 1.18
Weighted average shares outstanding (in shares)		636,986		577,397	200,546
United States Agriculture Index Fund [Member]
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions		$ (181,039)	[2]	$ (238,006)	$ 26,386
Change in unrealized gain (loss) on open positions		1,125	[2]	88,575	(95,857)
Realized gain (loss) on foreign currency transactions		51	[2]	(31)	(113)
Realized gain (loss) on short-term investments		(286)	[2]	0	0
Change in unrealized gain (loss) on foreign currency translations		(13)	[2]	612	504
Dividend income		2,777	[2]	0	0
Interest income	[1]	15,456		13,898	6,205
Total income (loss)		(161,929)	[2]	(134,952)	(62,875)
Expenses
Management fees (Note 4)		7,617	[2]	12,013	12,901
Professional fees		26,145	[2]	45,273	72,711
Brokerage commissions		1,498	[2]	1,923	2,150
Directors' fees and insurance		917	[2]	1,144	301
Total expenses		36,177	[2]	60,353	88,063
Expense waiver (Note 4)		(26,584)	[2]	(45,533)	(72,173)
Net expenses		9,593	[2]	14,820	15,890
Net income (loss)		$ (171,522)	[2]	$ (149,772)	$ (78,765)
Net income (loss) per share (in dollars per share)		$ (1.72)	[2]	$ (1.50)	$ (0.79)
Net income (loss) per weighted average share (in dollars per share)		$ (1.72)	[2]	$ (1.50)	$ (0.79)
Weighted average shares outstanding (in shares)		100,000	[2]	100,000	100,000
USCF Canadian Crude Oil Index Fund [Member]
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	[3]	$ 0
Change in unrealized gain (loss) on open positions	[3]	0
Realized gain (loss) on foreign currency transactions	[3]	0
Change in unrealized gain (loss) on foreign currency translations	[3]	0
Interest income	[3]	0
Total income (loss)	[3]	0
Expenses
Management fees (Note 4)	[3]	0
Professional fees	[3]	0
Brokerage commissions	[3]	0
Directors' fees and insurance	[3]	0
Total expenses	[3]	0
Expense waiver (Note 4)	[3]	0
Net expenses	[3]	0
Net income (loss)	[3]	$ 0
Net income (loss) per share (in dollars per share)	[3]	$ 0
Net income (loss) per weighted average share (in dollars per share)	[3]	$ 0
Weighted average shares outstanding (in shares)	[3]	0
United States Commodity Index Funds Trust [Member]
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions		$ (56,209,907)		$ 24,220,537	$ (22,057,127)
Change in unrealized gain (loss) on open positions		(23,145,242)		5,699,448	10,811,030
Realized gain (loss) on foreign currency transactions		51		(31)	(113)
Realized gain (loss) on short-term investments		(286)		(23)	0
Change in unrealized gain (loss) on foreign currency translations		(13)		612	504
Dividend income		425,685		0	0
Interest income	[1]	10,030,763		4,112,328	2,000,403
ETF transaction fees		31,150		20,300	18,900
Total income (loss)		(68,867,799)		34,053,171	(9,226,403)
Expenses
Management fees (Note 4)		4,730,151		4,205,743	4,842,987
Professional fees		773,654		719,854	704,658
Brokerage commissions		546,563		534,994	780,427
Directors' fees and insurance		94,778		72,525	74,722
Total expenses		6,145,146		5,533,116	6,402,794
Expense waiver (Note 4)		(77,884)		(85,686)	(147,813)
Net expenses		6,067,262		5,447,430	6,254,981
Net income (loss)		$ (74,935,061)		$ 28,605,741	$ (15,481,384)
[1]	Interest income does not exceed paid in kind of 5%.
[2]	USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.
[3]	The Sponsor contributed $1,000 on March 31, 2018. UCCO was in registration and had not commenced operations. The Fund filed to withdraw from registration on December 19, 2018.

Statements of Changes in Partne

Statements of Changes in Partners' Capital - USD ($)		United States Commodity Index Fund [Member]	United States Copper Index Fund [Member]	United States Agriculture Index Fund [Member]		USCF Canadian Crude Oil Index Fund [Member]		United States Commodity Index Funds Trust [Member]	Sponsor [Member]United States Commodity Index Fund [Member]	Sponsor [Member]United States Copper Index Fund [Member]	Sponsor [Member]United States Agriculture Index Fund [Member]		Sponsor [Member]USCF Canadian Crude Oil Index Fund [Member]		Sponsor [Member]United States Commodity Index Funds Trust [Member]	Shareholders [Member]United States Commodity Index Fund [Member]	Shareholders [Member]United States Copper Index Fund [Member]	Shareholders [Member]United States Agriculture Index Fund [Member]		Shareholders [Member]USCF Canadian Crude Oil Index Fund [Member]		Shareholders [Member]United States Commodity Index Funds Trust [Member]
Balances, Beginning at Dec. 31, 2015		$ 520,635,970	$ 2,135,390	$ 1,979,520				$ 524,750,880	$ 0	$ 0	$ 0				$ 0	$ 520,635,970	$ 2,135,390	$ 1,979,520				$ 524,750,880
Additions		207,139,996	3,352,232					210,492,228	0	0					0	207,139,996	3,352,232					210,492,228
Redemptions		(75,843,491)						(75,843,491)	0						0	(75,843,491)						(75,843,491)
Net income (loss)		(15,639,651)	237,032	(78,765)				(15,481,384)	0	0	0				0	(15,639,651)	237,032	(78,765)				(15,481,384)
Balances, Ending at Dec. 31, 2016		$ 636,292,824	$ 5,724,654	$ 1,900,755				$ 643,918,233	$ 0	$ 0	$ 0				$ 0	$ 636,292,824	$ 5,724,654	$ 1,900,755				$ 643,918,233
Shares Outstanding, Beginning at Dec. 31, 2015		12,850,000	150,000	100,000				13,100,000	0	0	0				0	12,850,000	150,000	100,000				13,100,000
Additions		4,900,000	200,000	0				5,100,000	0	0	0				0	4,900,000	200,000	0				5,100,000
Redemptions		(1,850,000)	0	0				(1,850,000)	0	0	0				0	(1,850,000)	0	0				(1,850,000)
Shares Outstanding, Ending at Dec. 31, 2016		15,900,000	350,000	100,000				16,350,000	0	0	0				0	15,900,000	350,000	100,000				16,350,000
Net asset value, beginning of period (in dollars per share) at Dec. 31, 2015		$ 40.52	$ 14.24	$ 19.80	[1]
Net asset value, end of period (in dollars per share) at Dec. 31, 2016		$ 40.02	$ 16.36	$ 19.01	[1]
Additions		$ 49,804,005	$ 12,667,909					$ 62,471,914	$ 0	$ 0					$ 0	$ 49,804,005	$ 12,667,909					$ 62,471,914
Redemptions		(211,345,839)	(8,027,253)					(219,373,092)	0	0					0	(211,345,839)	(8,027,253)					(219,373,092)
Net income (loss)		26,490,920	2,264,593	$ (149,772)				28,605,741	0	0	$ 0				0	26,490,920	2,264,593	$ (149,772)				28,605,741
Balances, Ending at Dec. 31, 2017		$ 501,241,910	$ 12,629,903	$ 1,750,983				$ 515,622,796	$ 0	$ 0	$ 0				$ 0	$ 501,241,910	$ 12,629,903	$ 1,750,983				$ 515,622,796
Additions		1,250,000	700,000	0				1,950,000	0	0	0				0	1,250,000	700,000	0				1,950,000
Redemptions		(5,350,000)	(450,000)	0				(5,800,000)	0	0	0				0	(5,350,000)	(450,000)	0				(5,800,000)
Shares Outstanding, Ending at Dec. 31, 2017		11,800,000	600,000	100,000				12,500,000	0	0	0				0	11,800,000	600,000	100,000				12,500,000
Net asset value, end of period (in dollars per share) at Dec. 31, 2017		$ 42.48	$ 21.05	$ 17.51	[1]
Net income (loss)		$ 2,873,099	$ (1,206,325)	$ (16,810)
Balances, Ending at Mar. 31, 2018	[2]					$ 0							$ 0							$ 0
Balances, Beginning at Dec. 31, 2017		501,241,910	12,629,903	1,750,983				$ 515,622,796	$ 0	$ 0	$ 0				$ 0	$ 501,241,910	$ 12,629,903	$ 1,750,983				$ 515,622,796
Additions		183,685,233	8,406,522					192,092,755	0	0					1,000	183,685,233	8,406,522					192,091,755
Redemptions		(150,113,664)	(6,538,962)	(1,579,461)	[1]			(158,233,087)	0	0	0	[1]			(1,000)	(150,113,664)	(6,538,962)	(1,579,461)	[1]			(158,232,087)
Net income (loss)		(71,770,971)	(2,992,568)	(171,522)	[1]	0	[2]	(74,935,061)	0	0	0	[1]			0	(71,770,971)	(2,992,568)	(171,522)	[1]			(74,935,061)
Balances, Ending at Dec. 31, 2018		$ 463,042,508	$ 11,504,895	$ 0	[1]	0	[2]	$ 474,547,403	$ 0	$ 0	$ 0	[1]	0	[2]	$ 0	$ 463,042,508	$ 11,504,895	$ 0	[1]	0	[2]	$ 474,547,403
Shares Outstanding, Beginning at Dec. 31, 2017		11,800,000	600,000	100,000				12,500,000	0	0	0				0	11,800,000	600,000	100,000				12,500,000
Additions		4,250,000	450,000	0	[1]			4,700,000	0	0	0	[1]			0	4,250,000	450,000	0	[1]			4,700,000
Redemptions		(3,700,000)	(350,000)	(100,000)	[1]			(4,150,000)	0	0	0	[1]			0	(3,700,000)	(350,000)	(100,000)	[1]			(4,150,000)
Shares Outstanding, Ending at Dec. 31, 2018		12,350,000	700,000	0	[1]			13,050,000	0	0	0	[1]			0	12,350,000	700,000	0	[1]			13,050,000
Net asset value, beginning of period (in dollars per share) at Dec. 31, 2017		$ 42.48	$ 21.05	$ 17.51	[1]
Net asset value, end of period (in dollars per share) at Dec. 31, 2018		$ 37.49	$ 16.44	$ 0	[1]
Balances, Beginning at Mar. 31, 2018	[2]					0							0							0
Additions	[2]					1,000							1,000							0
Redemptions	[2]					(1,000)							(1,000)							0
Net income (loss)	[2]					0							0							0
Balances, Ending at Dec. 31, 2018		$ 463,042,508	$ 11,504,895	$ 0	[1]	$ 0	[2]	$ 474,547,403	$ 0	$ 0	$ 0	[1]	$ 0	[2]	$ 0	$ 463,042,508	$ 11,504,895	$ 0	[1]	$ 0	[2]	$ 474,547,403
Shares Outstanding, Ending at Dec. 31, 2018		12,350,000	700,000	0	[1]			13,050,000	0	0	0	[1]			0	12,350,000	700,000	0	[1]			13,050,000
Net asset value, end of period (in dollars per share) at Dec. 31, 2018		$ 37.49	$ 16.44	$ 0	[1]
[1]	USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.
[2]	The Sponsor contributed $1,000 on March 31, 2018. UCCO was in registration and had not commenced operations. The Fund filed to withdraw from registration on December 19, 2018.

Statements of Cash Flows

Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
United States Commodity Index Fund [Member]
Cash Flows from Operating Activities:
Net income (loss)		$ (71,770,971)		$ 26,490,920		$ (15,639,651)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Increase) decrease in short-term investments		71,291,769		(71,291,769)		0
Unrealized (gain) loss on open futures contracts		21,360,954		(4,817,510)		(10,637,687)
(Increase) decrease in dividends receivable		(9,983)		0		0
(Increase) decrease in interest receivable		9,374		(12,337)		0
(Increase) decrease in directors' fees and insurance receivable		(22,319)		0		6,190
(Increase) decrease in ETF transaction fees receivable		350		0		(350)
Increase (decrease) in management fees payable		41,641		(119,158)		85,619
Increase (decrease) in professional fees payable		64,879		(20,651)		(133,821)
Increase (decrease) in brokerage commissions payable		0		(10,710)		11,200
Increase (decrease) in directors' fees and insurance payable		(5,496)		(668)		6,164
Net cash provided by (used in) operating activities		20,960,198		(49,781,883)		(26,302,336)
Cash Flows from Financing Activities:
Addition of shares		183,685,233		49,804,005		207,139,996
Redemption of shares		(152,234,093)		(215,240,793)		(69,828,108)
Net cash provided by (used in) financing activities		31,451,140		(165,436,788)		137,311,888
Net Increase (Decrease) in Cash and Cash Equivalents		52,411,338		(215,218,671)		111,009,552
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year		426,097,875		641,316,546		530,306,994
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year		478,509,213		426,097,875		641,316,546
United States Copper Index Fund [Member]
Cash Flows from Operating Activities:
Net income (loss)		(2,992,568)		2,264,593		237,032
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Increase) decrease in short-term investments		1,880,591		(2,175,807)		0
Unrealized (gain) loss on open futures contracts		1,785,413		(793,363)		(269,200)
(Increase) decrease in receivable from Sponsor		(11,146)		35,487		(16,039)
(Increase) decrease in dividends receivable		(1,356)		0		0
(Increase) decrease in interest receivable		916		(1,137)		0
(Increase) decrease in directors' fees and insurance receivable		35		(35)		32
(Increase) decrease in ETF transaction fees receivable		350		(350)		0
Increase (decrease) in payable due to Broker		(442,429)		442,429		0
Increase (decrease) in management fees payable		831		2,244		1,882
Increase (decrease) in professional fees payable		884		(28,380)		30,138
Increase (decrease) in directors' fees and insurance payable		53		(47)		47
Net cash provided by (used in) operating activities		221,574		(254,366)		(16,108)
Cash Flows from Financing Activities:
Addition of shares		10,511,457		10,562,974		3,352,232
Redemption of shares		(6,538,962)		(8,027,253)		0
Net cash provided by (used in) financing activities		3,972,495		2,535,721		3,352,232
Net Increase (Decrease) in Cash and Cash Equivalents		4,194,069		2,281,355		3,336,124
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year		7,922,175		5,640,820		2,304,696
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year		12,116,244		7,922,175		5,640,820
United States Agriculture Index Fund [Member]
Cash Flows from Operating Activities:
Net income (loss)		(171,522)	[1]	(149,772)		(78,765)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Increase) decrease in short-term investments		296,550	[1]	(296,550)		0
Unrealized (gain) loss on open futures contracts		(1,125)	[1]	(88,575)		95,856
(Increase) decrease in receivable from Sponsor		45,533	[1]	26,640		(15,849)
(Increase) decrease in interest receivable		269	[1]	(269)		46
(Increase) decrease in directors' fees and insurance receivable		183	[1]	(183)		0
Increase (decrease) in management fees payable		(2,032)	[1]	(97)		(42)
Increase (decrease) in professional fees payable		(44,877)	[1]	(24,518)		28,414
Increase (decrease) in directors' fees and insurance payable		0	[1]	(15)		(49)
Net cash provided by (used in) operating activities		122,979	[1]	(533,339)		29,611
Cash Flows from Financing Activities:
Addition of shares		0	[1]	0		0
Redemption of shares		(1,579,461)	[1]	0		0
Net cash provided by (used in) financing activities		(1,579,461)	[1]	0		0
Net Increase (Decrease) in Cash and Cash Equivalents		(1,456,482)	[1]	(533,339)		29,611
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year		1,456,482	[1]	1,989,821		1,960,210
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year		0	[1]	1,456,482	[1]	1,989,821
USCF Canadian Crude Oil Index Fund [Member]
Cash Flows from Operating Activities:
Net income (loss)	[2]	0
Cash Flows from Financing Activities:
Addition of shares	[2]	1,000
Redemption of shares	[2]	(1,000)
Net cash provided by (used in) financing activities	[2]	0
Net Increase (Decrease) in Cash and Cash Equivalents	[2]	0
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year	[2]	0
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year	[2]	0		0
United States Commodity Index Funds Trust [Member]
Cash Flows from Operating Activities:
Net income (loss)		(74,935,061)		28,605,741		(15,481,384)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Increase) decrease in short-term investments		73,468,910		(73,764,126)		0
Unrealized (gain) loss on open futures contracts		23,145,242		(5,699,448)		(10,811,031)
(Increase) decrease in receivable from Sponsor		34,387		62,127		(31,888)
(Increase) decrease in dividends receivable		(11,339)		0		0
(Increase) decrease in interest receivable		10,559		(13,743)		46
(Increase) decrease in directors' fees and insurance receivable		(22,101)		(218)		6,222
(Increase) decrease in ETF transaction fees receivable		700		(350)		(350)
Increase (decrease) in payable due to Broker		(442,429)		442,429		0
Increase (decrease) in management fees payable		40,440		(117,011)		87,459
Increase (decrease) in professional fees payable		20,886		(73,549)		(75,269)
Increase (decrease) in brokerage commissions payable		0		(10,710)		11,200
Increase (decrease) in directors' fees and insurance payable		(5,443)		(730)		6,162
Net cash provided by (used in) operating activities		21,304,751		(50,569,588)		(26,288,833)
Cash Flows from Financing Activities:
Addition of shares		194,197,690		60,366,979		210,492,228
Redemption of shares		(160,353,516)		(223,268,046)		(69,828,108)
Net cash provided by (used in) financing activities		33,844,174		(162,901,067)		140,664,120
Net Increase (Decrease) in Cash and Cash Equivalents		55,148,925		(213,470,655)		114,375,287
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year		435,476,532		648,947,187		534,571,900
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year		$ 490,625,457		$ 435,476,532		$ 648,947,187
[1]	USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.
[2]	The Sponsor contributed $1,000 on March 31, 2018. UCCO was in registration and had not commenced operations. The Fund filed to withdraw from registration on December 19, 2018.

Statements of Cash Flows (Paren

Statements of Cash Flows (Parenthetical) - USD ($)		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
United States Commodity Index Fund [Member]
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents		$ 427,657,030		$ 393,488,946	$ 601,266,026
Equity In Trading Accounts [Abstract]
Cash and Cash Equivalents		50,852,183		32,608,929	40,050,520
Total Cash, Cash Equivalents and Equity in Trading Accounts		478,509,213		426,097,875	641,316,546
United States Copper Index Fund [Member]
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents		10,753,786		7,124,096	5,387,655
Equity In Trading Accounts [Abstract]
Cash and Cash Equivalents		1,362,458		798,079	253,165
Total Cash, Cash Equivalents and Equity in Trading Accounts		12,116,244		7,922,175	5,640,820
United States Agriculture Index Fund [Member]
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents		0	[1]	1,297,110	1,781,515
Equity In Trading Accounts [Abstract]
Cash and Cash Equivalents		0	[1]	159,372	208,306
Total Cash, Cash Equivalents and Equity in Trading Accounts		0	[1]	1,456,482	1,989,821
USCF Canadian Crude Oil Index Fund [Member]
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents	[2]	0
Equity In Trading Accounts [Abstract]
Cash and Cash Equivalents		0
Total Cash, Cash Equivalents and Equity in Trading Accounts		0
United States Commodity Index Funds Trust [Member]
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents		438,410,816		401,910,152	608,435,196
Equity In Trading Accounts [Abstract]
Cash and Cash Equivalents		52,214,641		33,566,380	40,511,991
Total Cash, Cash Equivalents and Equity in Trading Accounts		$ 490,625,457		$ 435,476,532	$ 648,947,187
[1]	USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.
[2]	The Sponsor contributed $1,000 on March 31, 2018. UCCO was in registration and had not commenced operations. The Fund filed to withdraw from registration on December 19, 2018.

ORGANIZATION AND BUSINESS

ORGANIZATION AND BUSINESS	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization And Business	NOTE 1 - ORGANIZATION AND BUSINESS The United States Commodity Index Funds Trust (the “Trust”) was organized as a Delaware statutory trust on December 21, 2009. The Trust is a series trust formed pursuant to the Delaware Statutory Trust Act and includes the United States Commodity Index Fund (“USCI”), a commodity pool formed on April 1, 2010 and first made available to the public on August 10, 2010, the United States Copper Index Fund (“CPER”), a commodity pool formed on November 26, 2010 and first made available to the public on November 15, 2011, and the United States Agriculture Index Fund (“USAG”), a commodity pool formed on November 26, 2010 and first made available to the public on April 13, 2012. In addition, a fourth series of the Trust, the USCF Canadian Crude Oil Index Fund (“UCCO”) was formed on June 1, 2016. UCCO was in registration and had not commenced operations as of the filing of this annual report on Form 10-K. UCCO filed to withdraw from registration on December 19, 2018. USCI and CPER each issue shares (“shares”) that may be purchased and sold on the NYSE Arca, Inc. (“NYSE Arca”), and, until September 6, 2018, USAG issued shares that were purchased and sold on NYSE Arca. USCI, CPER, and USAG are collectively referred to herein as the “Trust Series.” The Trust, and each of its series operates pursuant to the Fourth Amended and Restated Declaration of Trust and Trust Agreement dated as of December 15, 2017 (the “Trust Agreement”). United States Commodity Funds LLC (“USCF”) is the sponsor of the Trust and each of its series and is also responsible for the management of the Trust and the Trust Series. For purposes of the financial statement presentation, unless specified otherwise, all references will be to the Trust Series. On August 7, 2018, the Board of Directors of USCF determined that USAG could not continue its business and operations in an economically efficient manner due to USAG’s inability to attract sufficient assets, thereby hindering its ability to operate efficiently. On that date, the Board of Directors of USCF also authorized and approved the closing and liquidation of USAG together with a plan of liquidation for USAG. The Trust filed a current report on Form 8-K dated August 8, 2018 with the SEC that included, as an exhibit a press release and the USAG plan of liquidation. USAG also filed a prospectus supplement with the SEC dated August 8, 2018. On September 6, 2018, USAG began the process of liquidating its portfolio. As a of the close of regular trading on the NYSE Arca on September 6, 2018, USAG ceased accepting orders for Creation Baskets and Redemption Baskets from authorized participants. Trading in the shares of USAG on the NYSE Arca was suspended prior to the open of the market on September 7, 2018. On September 7, 2018, the Trust, on behalf of USAG, filed a post-effective amendment to the registration statement with the U.S. Securities and Exchange Commission (the “SEC”) to terminate the offering of registered and unsold shares of USAG and, thereafter, the NYSE Arca filed a Form 25 to effect the withdrawal of the listings for USAG’s shares. The liquidation date for USAG was September 12, 2018 and the proceeds of the liquidation were sent to all remaining shareholders of USAG on or about September 13, 2018. For U.S. federal income tax purposes, these distributions to shareholders were treated as liquidating distributions and shareholders recognized gain or loss based on the difference between the amount of cash received as part of the liquidating distribution and their adjusted basis in their shares (taking into account all allocations of income, gain, loss, or deduction for the year of liquidation). Items of income, gain, loss, or deduction recognized as a result of the liquidation of USAG’s portfolio were allocated for U.S. federal tax purposes to the shareholders. Any other items of income, gain, loss, or deduction not attributable to the liquidation of USAG’s portfolio were allocated for U.S. federal income tax purposes in accordance with USAG’s general allocation conventions. For further information concerning the U.S. federal income tax consequences of acquiring, holding, and disposing of shares, please review the section titled “U.S. Federal Income Tax Considerations” in the Prospectus. In addition, shareholders who received such a distribution are encouraged to consult their own tax advisors concerning the impact of the liquidation of USAG in light of their own unique circumstances. USCF has the power and authority to establish and designate one or more series and to issue shares thereof, from time to time as it deems necessary or desirable. USCF has exclusive power to fix and determine the relative rights and preferences as between the shares of any series as to right of redemption, special and relative rights as to dividends and other distributions and on liquidation, conversion rights, and conditions under which the series shall have separate voting rights or no voting rights. The term for which the Trust is to exist commenced on the date of the filing of the Certificate of Trust, and the Trust and any Trust Series will exist in perpetuity, unless earlier terminated in accordance with the provisions of the Trust Agreement. Separate and distinct records must be maintained for each Trust Series and the assets associated with a Trust Series must be held in such separate and distinct records (directly or indirectly, including a nominee or otherwise) and accounted for in such separate and distinct records separately from the assets of any other Trust Series. Each Trust Series is separate from all other Trust Series created as series of the Trust in respect of the assets and liabilities allocated to that Trust Series and represents a separate investment portfolio of the Trust. The sole Trustee of the Trust is Wilmington Trust Company (the “Trustee”), a Delaware banking corporation. The Trustee is unaffiliated with USCF. The Trustee’s duties and liabilities with respect to the offering of shares and the management of the Trust are limited to its express obligations under the Trust Agreement. USCF is a member of the National Futures Association (the “NFA”) and became a commodity pool operator (“CPO”) registered with the Commodity Futures Trading Commission (the “CFTC”) effective December 1, 2005. The Trust and each Trust Series have a fiscal year ending on December 31. USCF is also the general partner of the United States Oil Fund, LP (“USO”), the United States Natural Gas Fund, LP (“UNG”), the United States 12 Month Oil Fund, LP (“USL”), the United States Gasoline Fund, LP (“UGA”) and the United States Diesel-Heating Oil Fund, LP (“UHN”), which listed their limited partnership shares on the American Stock Exchange (the “AMEX”) under the ticker symbols “USO” on April 10, 2006, “UNG” on April 18, 2007, “USL” on December 6, 2007, “UGA” on February 26, 2008 and “UHN” on April 9, 2008, respectively. As a result of the acquisition of the AMEX by NYSE Euronext, each of USO’s, UNG’s, USL’s, UGA’s and UHN’s shares commenced trading on the NYSE Arca on November 25, 2008. USCF is also the general partner of the United States Short Oil Fund, LP (“DNO”), the United States 12 Month Natural Gas Fund, LP (“UNL”) and the United States Brent Oil Fund, LP (“BNO”), which listed their limited partnership shares on the NYSE Arca under the ticker symbols “DNO” on September 24, 2009, “UNL” on November 18, 2009 and “BNO” on June 2, 2010, respectively. On August 7, 2018, the Board of Directors of USCF also authorized and approved the closing and liquidation of DNO and UHN together with a plan of liquidation for each of DNO and UHN. Each of DNO and UHN filed a current report on Form 8-K dated August 8, 2018 with the SEC that included, as an exhibit, the press release, the applicable plan of liquidation, and a copy of the notice of required withdrawal from the limited partnership sent to shareholders. In addition, each of DNO and UHN filed a prospectus supplement with the SEC dated August 8, 2018. The liquidation date for DNO and UHN was September 12, 2018 and the proceeds of the liquidation were sent to all remaining shareholders of DNO and UHN, respectively, on or about September 13, 2018, with a subsequent distribution of additional liquidation proceeds sent to UHN shareholders on or about September 18, 2018. Each of DNO and UHN also filed a post-effective amendment to the registration statement with the SEC to terminate the offering of registered and unsold shares of DNO and UHN, respectively, and the NYSE Arca filed Forms 25 to effect the withdrawal of the listings for shares of each of DNO and UHN. In addition, USCF is the sponsor of the USCF Funds Trust, a Delaware statutory trust, and each of its series, the United States 3x Oil Fund (“USOU”) and the United States 3x Short Oil Fund (“USOD”), which commenced operations on July 20, 2017. All funds listed previously, other than DNO, UHN and USAG, are referred to collectively herein as the “Related Public Funds.” Effective as of May 1, 2012, each of USCI, CPER and USAG issue shares to certain authorized purchasers (“Authorized Participants”) by offering baskets consisting of 50,000 shares (“Creation Baskets”) through ALPS Distributors, Inc., as the marketing agent (the “Marketing Agent”). Prior to May 1, 2012, each of USCI, CPER and USAG issued shares to Authorized Participants by offering baskets consisting of 100,000 shares through the Marketing Agent. The purchase price for a Creation Basket is based upon the net asset value (“NAV”) of a share calculated shortly after the close of the core trading session on the NYSE Arca on the day the order to create the basket is properly received. As noted above, as of the filing of this annual report on Form 10-K, USAG is no longer issuing shares. Authorized Participants pay each Trust Series a transaction fee of $350 for each order placed to create one or more Creation Baskets or to redeem one or more baskets (“Redemption Baskets”), consisting of 50,000 shares. Shares may be purchased or sold on a nationally recognized securities exchange in smaller increments than a Creation Basket or Redemption Basket. Shares purchased or sold on a nationally recognized securities exchange are not purchased or sold at the per share NAV of each Trust Series but rather at market prices quoted on such exchange.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	NOTE 2 — SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") as detailed in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification. Each Trust Series is an investment company and follows the accounting and reporting guidance in FASB Topic 946. The Trust financial statements included its respective series of funds financial statements including UCCO, USCI, CPER and USAG through December 31, 2018. Revenue Recognition Commodity futures contracts, forward contracts, physical commodities and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the financial statements. Changes in the unrealized gains or losses between periods are reflected in the statements of operations. Each Trust Series earns income on funds held at the custodian or a futures commission merchant (“FCM”) at prevailing market rates earned on such investments. Brokerage Commissions Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis. Income Taxes The Trust Series are not subject to federal income taxes; each investor reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return. In accordance with U.S. GAAP, each Trust Series is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. Each Trust Series files an income tax return in the U.S. federal jurisdiction and may file income tax returns in various U.S. states. None of the Trust Series is subject to income tax return examinations by major taxing authorities for years before 2015. The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in each Trust Series recording a tax liability that reduces net assets. However, each Trust Series' conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. Each Trust Series recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the year ended December 31, 2018 for any Trust Series. Creations and Redemptions Effective as of May 1, 2012, Authorized Participants may purchase Creation Baskets or redeem Redemption Baskets for USCI, CPER and USAG only in blocks of 50,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed. As noted above, as of the filing of this Annual Report on Form 10-K, USAG is no longer issuing shares. Each Trust Series receives or pays the proceeds from shares sold or redeemed within two business days after the trade date of the purchase or redemption. The amounts due from Authorized Participants are reflected in each Trust Series' statements of financial condition as receivable for shares sold and amounts payable to Authorized Participants upon redemption are reflected as payable for shares redeemed. Trust Capital and Allocation of Income and Losses Profit or loss shall be allocated among the shareholders of each Trust Series in proportion to the number of shares each investor holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the Trust Agreement . Calculation of Per Share NAV Each Trust Series' per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing that amount by the total number of shares outstanding. Each Trust Series uses the closing prices on the relevant Futures Exchanges (as defined in Note 3 below) of the Applicable Benchmark Component Futures Contracts (as defined in Note 3 below) that at any given time make up the Applicable Index (as defined in Note 3 below) (determined at the earlier of the close of such exchange or 2:30 p.m. New York time) for the contracts traded on the Futures Exchanges, but calculates or determines the value of all other investments of each Trust Series using market quotations, if available, or other information customarily used to determine the fair value of such investments. Net Income (Loss) Per Share Net income (loss) per share is the difference between the per share NAV at the beginning of each period and at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. As of December 31, 2018, USCF held 5 shares of USCI and 40 shares of CPER. As noted above, as of the filing of this Annual Report on Form 10-K, USAG is no longer issuing shares. Offering Costs Offering costs incurred in connection with the registration of shares prior to the commencement of the offering are borne by USCF. Offering costs incurred in connection with the registration of additional shares after the commencement of the offering are borne by each Trust Series. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. Costs borne by the Trust Series after the commencement of an offering are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted. Cash Equivalents Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of six months or less. Reclassification Certain amounts in the accompanying financial statements were reclassified to conform to the current presentation. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

TRUST SERIES

TRUST SERIES	12 Months Ended
	Dec. 31, 2018
Trust Series [Abstract]
Trust Series	NOTE 3 - TRUST SERIES In connection with the execution of the First Trust Agreement on April 1, 2010, USCI was designated as the first series of the Trust. USCF contributed $1,000 to the Trust upon its formation on December 21, 2009, representing an initial contribution of capital to the Trust. Following the designation of USCI as the first series of the Trust, the initial capital contribution of $1,000 was transferred from the Trust to USCI and deemed an initial contribution to USCI. In connection with the commencement of USCI’s initial offering of shares, USCF received 20 Sponsor Shares of USCI in exchange for the previously received capital contribution, representing a beneficial ownership interest in USCI. On July 30, 2010, USCI received a notice of effectiveness from the SEC for its registration of 50,000,000 shares on Form S-1 with the SEC. On August 10, 2010, USCI listed its shares on the NYSE Arca under the ticker symbol “USCI”. USCI established its initial per share NAV by setting the price at $50.00 and issued 100,000 shares in exchange for $5,000,000 on August 10, 2010. USCI also commenced investment operations on August 10, 2010 by purchasing Futures Contracts traded on the Futures Exchanges. In order to satisfy NYSE Arca listing standards that at least 100,000 shares be outstanding at the beginning of the trading day on the NYSE Arca, USCF purchased the initial Creation Basket from the initial Authorized Participant at the initial offering price. The $1,000 fee that would otherwise be charged to the Authorized Participant in connection with an order to create or redeem was waived in connection with the initial Creation Basket. USCF held such initial Creation Basket until September 3, 2010, at which time the initial Authorized Participant repurchased the shares comprising such basket in accordance with the specified conditions noted above. On September 14, 2011, USCF redeemed the 20 Sponsor Shares of USCI and, on September 19, 2011, USCF purchased 5 shares of USCI in the open market. In connection with the Second Amended and Restated Trust Agreement dated November 10, 2010, USAG and CPER were designated as additional series of the Trust. Following the designation of USAG and CPER as additional series, USCF made an initial capital contribution of $3,000 was transferred from USCF to the Trust. On November 10, 2010, the Trust transferred $1,000 to each of USAG and CPER, which was deemed a capital contribution to each series. On November 14, 2011, USCF received 40 Sponsor Shares of CPER in exchange for the previously received capital contribution, representing a beneficial interest in CPER. On December 7, 2011, USCF redeemed the 40 Sponsor Shares of CPER and purchased 40 shares of CPER in the open market. On April 13, 2012, USCF received 40 Sponsor Shares of USAG in exchange for the previously received capital contribution, representing a beneficial interest in USAG. On June 28, 2012, USCF redeemed the 40 Sponsor Shares of USAG and on October 3, 2012, purchased 5 shares of USAG on the open market. On September 7, 2018 all Sponsor Shares of USAG were redeemed and USAG discontinued trading and subsequently liquidated and distributed all proceeds to shareholders, as discussed above. In addition, on March 31, 2018, USCF contributed $1,000 to UCCO, which was deemed an initial capital contribution to the series. CPER and USAG received notice of effectiveness from the SEC for its registration of 30,000,000 CPER shares and 20,000,000 USAG shares on September 6, 2011. The order to permit listing CPER and USAG on the NYSE Arca was received on October 20, 2011. On November 15, 2011, CPER listed its shares on the NYSE Arca under the ticker symbol “CPER.” CPER established its initial per share NAV by setting the price at $25 and issued 100,000 shares to the initial Authorized Participant, Merrill Lynch Professional Clearing Corp., in exchange for $2,500,000 in cash on November 15, 2011. The $1,000 fee that would otherwise be charged to the Authorized Participant in connection with an order to create or redeem was waived in connection with the initial Creation Basket. On April 13, 2012, USAG listed its shares on the NYSE Arca under the ticker symbol “USAG.” USAG established its initial per share NAV by setting the price at $25. On April 14, 2012, USCF purchased two initial Creation Baskets of USAG. In accordance with applicable requirements of Regulation M under the Securities Exchange Act of 1934, as amended, (“Exchange Act”), no Creation Baskets were offered to Authorized Participants nor were the shares listed on the NYSE Arca until five business days had elapsed from the date of USCF’s purchase of the initial Creation Basket on April 4, 2012. The $1,000 fee that would have otherwise been charged in connection with an order to create or redeem was waived in connection with the initial Creation Basket. As discussed above, USAG is no longer issuing shares and its liquidation date was September 12, 2018. A new series of the Trust was designated on June 1, 2016, the USCF Canadian Crude Oil Index Fund (“UCCO”). UCCO has not commenced operations as of the filing of this annual report on Form 10-K. USCF and the Trustee entered into the Fourth Amended and Restated Declaration of Trust and Trust Agreement effective as of December 15, 2017. The Fund filed to withdraw from registration on December 19, 2018. USCI’s Investment Objective USCI invests in futures contracts for commodities that are currently traded on the New York Mercantile Exchange (the “NYMEX”), ICE Futures (“ICE Futures”), Chicago Board of Trade (“CBOT”), Chicago Mercantile Exchange (“CME”), London Metal Exchange (“LME”), Commodity Exchange, Inc. (“COMEX”) or on other foreign exchanges (the NYMEX, ICE Futures, CBOT, CME, LME, COMEX and other foreign exchanges, collectively, the “Futures Exchanges”) (such futures contracts, collectively, “Futures Contracts”) and, to a lesser extent, in order to comply with regulatory requirements or in view of market conditions, other commodity-based contracts and instruments such as cash-settled options on Futures Contracts, forward contracts relating to commodities, cleared swap contracts and other non-exchange traded over-the-counter (“OTC”) transactions that are based on the price of commodities and Futures Contracts (collectively, “Other Commodity-Related Investments”). The investment objective of USCI is for the daily changes in percentage terms of its shares’ per share NAV to reflect the daily changes in percentage terms of the SummerHaven Dynamic Commodity Index Total Return SM USCI seeks to achieve its investment objective by investing in Futures Contracts and Other Commodity-Related Investments such that daily changes in its’ per share NAV closely track the daily changes in the price of the SDCI. USCI’s positions in Commodity Interests are rebalanced on a monthly basis in order to track the changing nature of the SDCI. If Futures Contracts relating to a particular commodity remain in the SDCI from one month to the next, such Futures Contracts are rebalanced to the 7.14% target weight. Specifically, on the Selection Date, it will be determined if a current Benchmark Component Futures Contract will be replaced by a new Futures Contract in either the same or different underlying commodity as a Benchmark Component Futures Contract for the following month, in which case USCI’s investments would have to be changed accordingly. In order that USCI’s trading does not unduly cause extraordinary market movements, and to make it more difficult for third parties to profit by trading based on market movements that could be expected from changes in the Benchmark Component Futures Contracts, USCI’s investments typically are not rebalanced entirely on a single day, but rather typically rebalanced over a period of four days. After fulfilling the margin and collateral requirements with respect to its Commodity Interests, USCF invests the remainder of USCI’s proceeds from the sale of shares in Treasuries or cash equivalents, and/or merely hold such assets in cash (generally in interest-bearing accounts). USCI’s shares began trading on August 10, 2010. As of December 31, 2018, USCI held 2,253 Futures Contracts on the NYMEX, 2,276 Futures Contracts on the ICE Futures, 4,037 Futures Contracts on the CBOT, 1,121 Futures Contracts on the CME, 5,819 Futures Contracts on the LME and 753 Futures Contracts on the COMEX, totaling 16,259 futures contracts. CPER’s Investment Objective The investment objective of CPER is for the daily changes in percentage terms of its shares’ per share NAV to reflect the daily changes in percentage terms of the SummerHaven Copper Index Total Return SM CPER’s shares began trading on November 15, 2011. As of December 31, 2018, CPER held 174 Futures Contracts on the COMEX. USAG’s Investment Objective The investment objective of USAG was for the daily changes in percentage terms of its shares’ per share NAV to reflect the daily changes in percentage terms of the SummerHaven Dynamic Agriculture Index Total Return SM USAG’s shares began trading on April 13, 2012 and ceased trading on September 7, 2018. As of December 31, 2018, USAG had liquidated all its assets and distributed cash pro rata to all remaining shareholders. Other Defined Terms – Trust Series The SDCI, the SCI and the SDAI are referred to throughout these Notes to Financial Statements collectively as the “Applicable Index” or “Indices.” Benchmark Component Futures Contracts, Benchmark Component Copper Futures Contracts and Benchmark Component Agriculture Futures Contracts are referred to throughout these Notes to Financial Statements collectively as “Applicable Benchmark Component Futures Contracts.” Other Commodity-Related Investments and Other Copper-Related Investments are referred to throughout these Notes to Financial Statements collectively as “Other Related Investments.” Trading Advisor and Trustee The Trust Series’ trading advisor is SummerHaven Investment Management, LLC (“SummerHaven”), a Delaware limited liability company that is registered as a commodity trading advisor and CPO with the CFTC and is a member of the NFA. In addition, SummerHaven is registered as an investment adviser under the Investment Advisers Act of 1940 with the SEC. SummerHaven provides advisory services to USCF with respect to the Applicable Index of each Trust Series and the investment decisions of each Trust Series. The Trustee accepts service of legal process on the Trust in the State of Delaware and makes certain filings under the Delaware Statutory Trust Act. The Trustee does not owe any other duties to the Trust, USCF or the shareholders.

FEES PAID BY EACH TRUST SERIES

FEES PAID BY EACH TRUST SERIES AND RELATED PARTY TRANSACTIONS	12 Months Ended
	Dec. 31, 2018
Fees Paid By Usci and Cper and Related Party Transactions [Abstract]
Fees Paid By Each Trust Series And Related Party Transactions	NOTE 4 — FEES PAID BY EACH TRUST SERIES AND RELATED PARTY TRANSACTIONS USCF Management Fee Under the Trust Agreement, USCF is responsible for investing the assets of each Trust Series in accordance with the objectives and policies of each such Trust Series. In addition, USCF has arranged for one or more third parties to provide trading advisory, administrative, custody, accounting, transfer agency and other necessary services to each Trust Series. For these services, each of USCI, CPER and USAG is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.95% per annum of average daily total net assets. Effective January 1, 2016, USCF permanently lowered the management fee to 0.80% (80 basis points) per annum of average daily total net assets for USCI and 0.65% (65 basis points) per annum of average daily total net assets for both CPER and USAG, respectively. Trustee Fee The Trustee is the Delaware trustee of the Trust. In connection with the Trustee’s services, USCF is responsible for paying the Trustee’s annual fee in the amount of $3,000. Ongoing Registration Fees and Other Offering Expenses Each Trust Series pays the costs and expenses associated with the ongoing registration of its shares subsequent to the initial offering. These costs include registration or other fees paid to regulatory agencies in connection with the offer and sale of shares, and all legal, accounting, printing and other expenses associated with such offer and sale. During the years ended December 31, 2018, 2017 and 2016, none of the Trust Series incurred any registration fees or other offering expenses. Independent Directors’ and Officers’ Expenses Each Trust Series is responsible for paying its portion of the directors’ fees and directors’ and officers’ liability insurance for such Trust Series and the Related Public Funds. Each Trust Series shares the fees and expenses on a pro rata basis with each other Trust Series and each Related Public Fund, as described above, based on the relative assets of each fund computed on a daily basis. These fees and expenses for the year ended December 31, 2018 amounted to be a total of $521,689 for the Trust Series and the Related Public Funds. USCI’s portion of such fees and expenses for the year ended December 31, 2018 was $91,761, CPER’s portion of such fees and expenses for the year ended December 31, 2018 was $2,100 and USAG’s portion of such fees and expenses for the year ended December 31, 2018 was $917. For the year ended December 31, 2017, these fees and expenses were $536,375 for the Trust Series and the Related Public Funds. USCI’s portion of such fees and expenses for the year ended December 31, 2017 was $69,558, CPER’s portion of such fees and expenses for the year ended December 31, 2017 was $1,823 and USAG’s portion of such fees and expenses for the year ended December 31, 2017 was $1,144. Investor Tax Reporting Cost The fees and expenses associated with each Trust Series' audit expenses and tax accounting and reporting requirements are paid by such Trust Series. These costs amounted to a total of $675,000 for the year ended December 31, 2018 for USCI, $60,000 for the year ended December 31, 2018 for CPER and $25,000 for the year ended December 31, 2018 for USAG. Tax reporting costs fluctuate between years due to the number of shareholders during any given year. Other Expenses and Fees and Expense Waivers In addition to the fees described above, each Trust Series pays all brokerage fees and other expenses in connection with the operation of such Trust Series, excluding costs and expenses paid by USCF as outlined in Note 5 – Contracts and Agreements below. USCF pays certain expenses normally borne by CPER to the extent that such expenses exceed 0.15% (15 basis points) of CPER’s NAV, on an annualized basis. USCF has no obligation to continue such payments into subsequent periods. For the year ended December 31, 2018, USCF waived $51,300 of expenses for CPER and $26,584 of expenses for USAG. This voluntary expense waiver is in addition to those amounts USCF is contractually obligated to pay as described in Note 5 – Contracts and Agreements below.

CONTRACTS AND AGREEMENTS

CONTRACTS AND AGREEMENTS	12 Months Ended
	Dec. 31, 2018
Contractors [Abstract]
Contracts And Agreements	NOTE 5 — CONTRACTS AND AGREEMENTS Marketing Agent Agreement USCF and the Trust, each on its own behalf and on behalf of each Trust Series, are party to a marketing agent agreement, dated as of July 22, 2010, as amended from time to time, with the Marketing Agent, whereby the Marketing Agent provides certain marketing services for each Trust Series as outlined in the agreement. The fee of the Marketing Agent, which is borne by USCF, is equal to 0.06% on each Trust Series' assets up to $3 billion and 0.04% on each Trust Series' assets in excess of $3 billion. In no event may the aggregate compensation paid to the Marketing Agent and any affiliate of USCF for distribution-related services exceed 10% of the gross proceeds of each Trust Series' offering. The above fee does not include website construction and development, which are also borne by USCF.   Brown Brothers Harriman & Co. Agreements USCF and the Trust, on its own behalf and on behalf of each Trust Series, are also party to a custodian agreement, dated July 22, 2010, as amended from time to time, with Brown Brothers Harriman & Co. (“BBH&Co.”), whereby BBH&Co. holds investments on behalf of each Trust Series. USCF pays the fees of the custodian, which are determined by the parties from time to time. In addition, USCF and the Trust, on its own behalf and on behalf of each Trust Series, are party to an administrative agency agreement, dated July 22, 2010, as amended from time to time, with BBH&Co., whereby BBH&Co. acts as the administrative agent, transfer agent and registrar for each Trust Series. USCF also pays the fees of BBH&Co. for its services under such agreement and such fees are determined by the parties from time to time. Currently, USCF pays BBH&Co. for its services, in the foregoing capacities, a minimum amount of $75,000 annually for its custody, fund accounting and fund administration services rendered to each Trust Series and each of the Related Public Funds, as well as a $20,000 annual fee for its transfer agency services. In addition, USCF pays BBH&Co. an asset-based charge of (a) 0.06% for the first $500 million of the Related Public Funds’ combined net assets, (b) 0.0465% for the Related Public Funds’ combined net assets greater than $500 million but less than $1 billion, and (c) 0.035% once the Related Public Funds’ combined net assets exceed $1 billion. The annual minimum amount will not apply if the asset-based charge for all accounts in the aggregate exceeds $75,000. USCF also pays BBH&Co. transaction fees ranging from $7 to $15 per transaction. Brokerage and Futures Commission Merchant Agreements On July 7, 2014, the Trust on behalf of each Trust Series entered into a Futures and Cleared Swaps Agreement with Wells Fargo Securities, LLC (“WFS”). In addition, the Trust on behalf of each of USCI and CPER entered into a Futures and Cleared Derivatives Transactions Customer Account Agreement with RBC, in June of 2018. Each of RBC and WFS are referred to as a “Futures Commissions Merchant” or “FCM.” Each of the Trust's FCM agreements require the FCM to provide services to the applicable Trust Series in connection with the purchase and sale of Futures Contracts and Other Related Investments that may be purchased and sold by or through the FCM for the applicable Trust Series' account. In accordance with each agreement, the FCM charges the applicable Trust Series commissions of approximately $7 to $8 per round-turn trade, including applicable exchange, clearing and NFA fees for Futures Contracts and options on Futures Contracts. Such fees include those incurred when purchasing Futures Contracts and options on Futures Contracts when each Trust Series issues shares as a result of a Creation Basket, as well as fees incurred when selling Futures Contracts and options on Futures Contracts when each Trust Series redeems shares as a result of a Redemption Basket. Such fees are also incurred when Futures Contracts and options on Futures Contracts are purchased or redeemed for the purpose of rebalancing the portfolio. Each Trust Series also incurs commissions to brokers for the purchase and sale of Futures Contracts, Other Commodity-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”). USCI For the Year Ended December 31, 2018 For the Year Ended December 31, 2017 For the Year Ended December 31, 2016 Total commissions accrued to brokers $ 539,884 $ 527,610 $ 776,649 Total commissions as annualized percentage of average total net assets 0.09 % 0.10 % 0.13 % Commissions accrued as a result of rebalancing $ 508,021 $ 505,199 $ 752,519 Percentage of commissions accrued as a result of rebalancing 94.10 % 95.75 % 96.89 % Commissions accrued as a result of creation and redemption activity $ 31,863 $ 22,411 $ 24,130 Percentage of commissions accrued as a result of creation and redemption activity 5.90 % 4.25 % 3.11 % The increase in total commissions accrued to brokers for the year ended December 31, 2018, compared to the year ended December 31, 2017, was due primarily to a higher number of contracts held and traded. The decrease in total commissions accrued to brokers for the year ended December 31, 2017, compared to the year ended December 31, 2016, was due primarily to lower number of futures contracts being held and traded. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters. CPER For the Year Ended December 31, 2018 For the Year Ended December 31, 2017 For the Year Ended December 31, 2016 Total commissions accrued to brokers $ 5,181 $ 5,461 $ 1,628 Total commissions as annualized percentage of average total net assets 0.04 % 0.05 % 0.06 % Commissions accrued as a result of rebalancing $ 4,205 $ 4,390 $ 1,455 Percentage of commissions accrued as a result of rebalancing 81.16 % 80.39 % 89.37 % Commissions accrued as a result of creation and redemption activity $ 976 $ 1,071 $ 173 Percentage of commissions accrued as a result of creation and redemption activity 18.84 % 19.61 % 10.63 % The decrease in total commissions accrued to brokers for the year ended December 31, 2018, compared to the year ended December 31, 2017, was due primarily to a lower number of contracts held and traded. The increase in total commissions accrued to brokers for the year ended December 31, 2017, compared to the year ended December 31, 2016, was due primarily to higher number of futures contracts being held and traded. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters. USAG For the Year Ended December 31, 2018 (In Liquidation)* For the Year Ended December 31, 2017 For the Year Ended December 31, 2016 Total commissions accrued to brokers $ 1,498 $ 1,923 $ 2,150 Total commissions as annualized percentage of average total net assets 0.09 % 0.10 % 0.11 % Commissions accrued as a result of rebalancing $ 1,498 $ 1,923 $ 2,150 Percentage of commissions accrued as a result of rebalancing 100.00 % 100.00 % 100.00 % Commissions accrued as a result of creation and redemption activity $ — $ — $ — Percentage of commissions accrued as a result of creation and redemption activity —% —% —% * USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018. The increase/decrease in total commissions accrued to brokers for the year ended December 31, 2018, compared to the year ended December 31, 2017, was due primarily to a higher/lower number of contracts held and traded. The decrease in total commissions accrued to brokers for the year ended December 31, 2017, compared to the year ended December 31, 2016, was due primarily to lower number of futures contracts being held and traded. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters. SummerHaven Agreements USCF is party to an Amended and Restated Advisory Agreement, dated as of May 1, 2018, as amended from time to time, with SummerHaven, whereby SummerHaven provides advisory services to USCF with respect to the Applicable Index for each Trust Series and investment decisions for each Trust Series. SummerHaven’s advisory services include, but are not limited to, general consultation regarding the calculation and maintenance of the Applicable Index for each Trust Series, anticipated changes to each Applicable Index and the nature of each Applicable Index’s current or anticipated component securities. For these services, USCF pays SummerHaven a fee based on a percentage of the average total net assets of each Trust Series. Prior to May 1, 2018, for USCI, the fee was equal to the percentage fees paid to USCF minus 0.14%, with that result multiplied by 0.5, minus 0.06% to arrive at the actual fee paid. Prior to May 1, 2018, for CPER and USAG, the fee was equal to the percentage fees paid to USCF minus 0.18%, with that result multiplied by 0.5, minus 0.6% to arrive at the actual fee paid. USCF and SummerHaven amended and restated the existing Advisory Agreement effective as of May 1, 2018. As of May 1, 2018, USCF pays SummerHaven an annual fee of $15,000 per each Trust Series as well as an annual fee of 0.06% of the average daily total net assets of each Trust Series. USCF is also party to an Amended and Restated Licensing Agreement, dated as of May 1, 2018, as amended from time to time, with SummerHaven and SHIM, pursuant to which SHIM grants a license to USCF for the use of certain names and marks, including the Applicable Index for each Trust Series in exchange for a fee to be paid by USCF to SHIM. For the year ended December 31, 2017, USCF paid licensing fees to SummerHaven equal to an annual fee of $15,000 per each Trust Series for the, plus an annual fee of 0.06% of the average daily total net assets of each Trust Series. As a result of the amendment and restatement of the Licensing Agreement and Advisory Agreement in May of 2018, the fees required to be paid by USCF to SummerHaven and SHIM in the aggregate have not changed from the aggregate fees paid by USCF under the two agreements prior to the amendment and restatement.

FINANCIAL INSTRUMENTS, OFF-BALA

FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Financial Instruments, Off-Balance Sheet Risks and Contingencies	NOTE 6 — FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES Each Trust Series engages in the trading of futures contracts, options on futures contracts, cleared swaps and OTC swaps (collectively, “derivatives”). As such, each Trust Series is exposed to both market risk, which is the risk arising from changes in the market value of the contracts, and credit risk, which is the risk of failure by another party to perform according to the terms of a contract. Each Trust Series may enter into futures contracts, options on futures contracts and cleared swaps to gain exposure to changes in the value of an underlying commodity. A futures contract obligates the seller to deliver (and the purchaser to accept) the future delivery of a specified quantity and type of a commodity at a specified time and place. Some futures contracts may call for physical delivery of the asset, while others are settled in cash. The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity or by making an offsetting sale or purchase of an identical futures contract on the same or linked exchange before the designated date of delivery. Cleared swaps are agreements that are eligible to be cleared by a clearinghouse, e.g., ICE Clear Europe, and provide the efficiencies and benefits that centralized clearing on an exchange offers to traders of futures contracts, including credit risk intermediation and the ability to offset positions initiated with different counterparties. The purchase and sale of futures contracts, options on futures contracts and cleared swaps require margin deposits with an FCM. Additional deposits may be necessary for any loss on contract value. The Commodity Exchange Act requires an FCM to segregate all customer transactions and assets from the FCM’s proprietary activities. Futures contracts, options on futures contracts and cleared swaps involve, to varying degrees, elements of market risk (specifically commodity price risk) and exposure to loss in excess of the amount of variation margin. The face or contract amounts reflect the extent of the total exposure each Trust Series has in the particular classes of instruments. Additional risks associated with the use of futures contracts are an imperfect correlation between movements in the price of the futures contracts and the market value of the underlying securities and the possibility of an illiquid market for a futures contract. Buying and selling options on futures contracts exposes investors to the risks of purchasing or selling futures contracts. All of the futures contracts held by each Trust Series through December 31, 2018 were exchange-traded. The risks associated with exchange-traded contracts are generally perceived to be less than those associated with OTC swaps since, in OTC swaps, a party must rely solely on the credit of its respective individual counterparties. However, in the future, if each Trust Series were to enter into non-exchange traded contracts (including Exchange for Related Position or EFRP), it would be subject to the credit risk associated with counterparty non-performance. The credit risk from counterparty non-performance associated with such instruments is the net unrealized gain, if any, on the transaction. Currently, each Trust Series has credit risk under its futures contracts since the sole counterparty to all domestic and foreign futures contracts is the clearinghouse for the exchange on which the relevant contracts are traded. In addition, each Trust Series bears the risk of financial failure by the clearing broker. A Trust Series' cash and other property, such as Treasuries, deposited with an FCM are considered commingled with all other customer funds, subject to the FCM’s segregation requirements. In the event of an FCM’s insolvency, recovery may be limited to a pro rata share of segregated funds available. It is possible that the recovered amount could be less than the total of cash and other property deposited. The insolvency of an FCM could result in the complete loss of a Trust Series' assets posted with that FCM; however, the majority of each Trust Series' assets are held in investments in Treasuries, cash and/or cash equivalents with the Trust Series' custodian and would not be impacted by the insolvency of an FCM. The failure or insolvency of the Trust Series' custodian, however, could result in a substantial loss of each Trust Series' assets. USCF may invest a portion of each Trust Series' cash in money market funds that seek to maintain a stable per share NAV. Each Trust Series may be exposed to any risk of loss associated with an investment in such money market funds. As of December 31, 2018, USCI and CPER held investments in money market funds in the amounts of $6,400,000 and $855,000, respectively. As of December 31, 2017, USCI, CPER and USAG held investments in money market funds in the amounts of $9,000,000, $990,000 and $300,000, respectively. Each Trust Series also holds cash deposits with its custodian. Pursuant to a written agreement with BBH&Co., uninvested overnight cash balances are swept to offshore branches of U.S. regulated and domiciled banks located in Toronto, Canada; London, United Kingdom; Grand Cayman, Cayman Islands; and Nassau, Bahamas; which are subject to U.S. regulation and regulatory oversight. As of December 31, 2018 and December 31, 2017, USCI held cash deposits and investments in Treasuries in the amounts of $472,109,213 and $488,389,644, respectively, with the custodian and FCMs. As of December 31, 2018 and December 31, 2017, CPER held cash deposits and investments in Treasuries in the amounts of $11,556,460 and $9,107,982, respectively, with the custodian and FCMs. As of December 31, 2017, USAG held cash deposits and investments in Treasuries in the amount of $1,453,032, with the custodian and FCM. Some or all of these amounts may be subject to loss should the Trust Series' custodian and/or FCMs cease operations. For derivatives, risks arise from changes in the market value of the contracts. Theoretically, each Trust Series is exposed to market risk equal to the value of Futures Contracts purchased and unlimited liability on such contracts sold short. As both a buyer and a seller of options, each Trust Series pays or receives a premium at the outset and then bears the risk of unfavorable changes in the price of the contract underlying the option. The Trust Series' policy is to continuously monitor its exposure to market and counterparty risk through the use of a variety of financial, position and credit exposure reporting controls and procedures. In addition, the Trust Series or USCF have a policy of requiring review of the credit standing of each broker or counterparty with which they conduct business. The financial instruments held by the applicable Trust Series are reported in its statements of financial condition at market or fair value, or at carrying amounts that approximate fair value, because of their highly liquid nature and short-term maturity.

FINANCIAL HIGHLIGHTS

FINANCIAL HIGHLIGHTS	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Highlights	NOTE 7 - FINANCIAL HIGHLIGHTS The following tables present per share performance data and other supplemental financial data for each Trust Series for the years ended December 31, 2018, 2017 and 2016 for the shareholders. This information has been derived from information presented in the financial statements. USCI Year ended December 31, 2018 Year ended December 31, 2017 Year ended December 31, 2016 Per Share Operating Performance: Net asset value, beginning of year $ 42.48 $ 40.02 $ 40.52 Total income (loss) (4.56 ) 2.87 (0.07 ) Total expenses (0.43 ) (0.41 ) (0.43 ) Net increase (decrease) in net asset value (4.99 ) 2.46 (0.50 ) Net asset value, end of year $ 37.49 $ 42.48 $ 40.02 Total Return (11.75 )% 6.15 % (1.23 )% Ratios to Average Net Assets Total income (loss) (11.33 )% 6.17 % (1.57 )% Management fees 0.80 %* 0.80 %* 0.80 %* Total expenses excluding management fees 0.23 % 0.24 % 0.23 % Expenses waived — %* — %* — %* Net expenses excluding management fees 0.23 % 0.24 % 0.23 % Net income (loss) (12.36 )% 5.14 % (2.60 )% * Effective January 1, 2016, USCF permanently lowered the management fee to 0.80% (80 basis points) per annum of average daily total net assets for USCI. CPER Year ended December 31, 2018 Year ended December 31, 2017 Year ended December 31, 2016 Per Share Operating Performance: Net asset value, beginning of year $ 21.05 $ 16.36 $ 14.24 Total income (loss) (4.46 ) 4.83 2.24 Net expenses (0.15 ) (0.14 ) (0.12 ) Net increase (decrease) in net asset value (4.61 ) 4.69 2.12 Net asset value, end of year $ 16.44 $ 21.05 $ 16.36 Total Return (21.90 )% 28.67 % 14.89 % Ratios to Average Net Assets Total income (loss) (24.49 )% 22.70 % 8.84 % Management fees 0.65 %* 0.65 %* 0.65 %* Total expenses excluding management fees 0.58 % 0.54 % 2.71 % Expenses waived (0.43 )%*† (0.39 )%*† (2.56 )%*† Net expenses excluding management fees 0.15 % 0.15 % 0.15 % Net income (loss) (25.29 )% 21.90 % 8.04 % * Effective January 1, 2016, USCF permanently lowered the management fee to 0.65% (65 basis points) per annum of average daily total net assets for CPER. † USCF paid certain expenses on a discretionary basis typically borne by CPER where expenses exceeded 0.15% (15 basis points) of CPER’s NAV, on an annualized basis. USCF has no obligation to continue such payments into subsequent periods. USAG Year ended December 31, 2018 (In Liquidation)* Year ended December 31, 2017 Year ended December 31, 2016 Per Share Operating Performance: Net asset value, beginning of year $ 17.51 $ 19.01 $ 19.80 Total income (loss) (1.62 ) (1.35 ) (0.63 ) Net expenses (0.10 ) (0.15 ) (0.16 ) Net increase (decrease) in net asset value (1.72 ) (1.50 ) (0.79 ) Net asset value, end of year $ 15.79 ** $ 17.51 $ 19.01 Total Return (9.82 )% (7.89 )% (3.99 )% Ratios to Average Net Assets Total income (loss) (9.43 )% (7.30 )% (3.17 )% Management fees 0.65 %*** 0.65 %*** 0.65 %*** Total expenses excluding management fees 2.44 % 2.62 % 3.79 % Expenses waived (2.29 )%***† (2.47 )%***† (3.64 )%***† Net expenses excluding management fees 0.15 % 0.15 % 0.15 % Net income (loss) (9.98 )% (8.10 )% (3.97 )% * USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018. ** Net asset value as of September 6, 2018. *** Effective January 1, 2016, USCF permanently lowered the management fee to 0.65% (65 basis points) per annum of average daily total net assets for USAG. † USCF paid certain expenses on a discretionary basis typically borne by USAG where expenses exceeded 0.15% (15 basis points) of USAG’s NAV, on an annualized basis. USCF has no obligation to continue such payments into subsequent periods. Total returns are calculated based on the change in value during the period. An individual shareholder’s total return and ratio may vary from the above total returns and ratios based on the timing of contributions to and withdrawals from each Trust Series.

QUARTERLY FINANCIAL DATA (Unaud

QUARTERLY FINANCIAL DATA (Unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Data [Abstract]
Quarterly financial data (Unaudited)	NOTE 8 – QUARTERLY FINANCIAL DATA (Unaudited) The following summarized (unaudited) quarterly financial information presents the results of operations and other data for the three-month periods ended March 31, June 30, September 30 and December 31, 2018 and 2017. USCI First Quarter 2018 Second Quarter 2018 Third Quarter 2018 Fourth Quarter 2018 Total Income (Loss) $ 4,264,134 $ 14,855,407 $ (19,156,279 ) $ (65,771,228 ) Total Expenses 1,391,035 1,536,430 1,639,497 1,396,043 Net Income (Loss) $ 2,873,099 $ 13,318,977 $ (20,795,776 ) $ (67,167,271 ) Net Income (Loss) per Share $ 0.24 $ 0.98 $ (1.24 ) $ (4.97 ) First Quarter 2017 Second Quarter 2017 Third Quarter 2017 Fourth Quarter 2017 Total Income (Loss) $ (9,365,854 ) $ (9,718,956 ) $ 21,340,388 $ 29,585,153 Total Expenses 1,431,730 1,424,635 1,186,116 1,307,330 Net Income (Loss) $ (10,797,584 ) $ (11,143,591 ) $ 20,154,272 $ 28,277,823 Net Income (Loss) per Share $ (0.81 ) $ (0.75 ) $ 1.62 $ 2.40 CPER First Quarter 2018 Second Quarter 2018 Third Quarter 2018 Fourth Quarter 2018 Total Income (Loss) $ (1,178,835 ) $ (389,444 ) $ (582,529 ) $ (747,096 ) Total Expenses 35,759 33,533 37,461 39,211 Expense Waivers (8,269 ) (10,931 ) (15,472 ) (16,628 ) Net Expenses 27,490 22,602 21,989 22,583 Net Income (Loss) $ (1,206,325 ) $ (412,046 ) $ (604,518 ) $ (769,679 ) Net Income (Loss) per Share $ (1.75 ) $ (0.58 ) $ (1.12 ) $ (1.16 ) First Quarter 2017 Second Quarter 2017 Third Quarter 2017 Fourth Quarter 2017 Total Income (Loss) $ 392,246 $ 114,427 $ 830,774 $ 1,009,945 Total Expenses 36,305 34,700 29,845 22,102 Expense Waivers (17,779 ) (7,307 ) (10,493 ) (4,574 ) Net Expenses 18,526 27,393 19,352 17,528 Net Income (Loss) $ 373,720 $ 87,034 $ 811,422 $ 992,417 Net Income (Loss) per Share $ 0.95 $ 0.19 $ 1.47 $ 2.08 USAG First Quarter 2018 Second Quarter 2018 Third Quarter 2018* Fourth Quarter 2018* Total Income (Loss) $ (13,280 ) $ (65,797 ) $ (82,852 ) $ — Total Expenses 14,429 12,956 8,792 — Expense Waivers (10,899 ) (9,525 ) (6,160 ) — Net Expenses 3,530 3,431 2,632 — Net Income (Loss) $ (16,810 ) $ (69,228 ) $ (85,484 ) $ — Net Income (Loss) per Share $ (0.17 ) $ (0.69 ) $ (0.86 ) $ — First Quarter 2017 Second Quarter 2017 Third Quarter 2017 Fourth Quarter 2017 Total Income (Loss) $ (10,243 ) $ (13,891 ) $ (113,661 ) $ 2,843 Total Expenses 22,497 7,643 17,981 12,232 Expense Waivers (18,575 ) (3,979 ) (14,271 ) (8,708 ) Net Expenses 3,922 3,664 3,710 3,524 Net Income (Loss) $ (14,165 ) $ (17,555 ) $ (117,371 ) $ (681 ) Net Income (Loss) per Share $ (0.14 ) $ (0.18 ) $ (1.17 ) $ (0.01 ) * USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Of Financial Instruments	NOTE 9 — FAIR VALUE OF FINANCIAL INSTRUMENTS The Trust and each Trust Series value their investments in accordance with Accounting Standards Codification 820 – Fair Value Measurements and Disclosures (“ASC 820”). ASC 820 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurement. The changes to past practice resulting from the application of ASC 820 relate to the definition of fair value, the methods used to measure fair value, and the expanded disclosures about fair value measurement. ASC 820 establishes a fair value hierarchy that distinguishes between: (1) market participant assumptions developed based on market data obtained from sources independent of the Trust and each Trust Series (observable inputs) and (2) the Trust's and each Trust Series' own assumptions about market participant assumptions developed based on the best information available under the circumstances (unobservable inputs). The three levels defined by the ASC 820 hierarchy are as follows: Level I – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level II – Inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. Level II assets include the following: quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market-corroborated inputs). Level III – Unobservable pricing input at the measurement date for the asset or liability. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available. In some instances, the inputs used to measure fair value might fall within different levels of the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement in its entirety falls shall be determined based on the lowest input level that is significant to the fair value measurement in its entirety. The following table summarizes the valuation of USCI’s securities at December 31, 2018 using the fair value hierarchy: At December 31, 2018 Total Level I Level II Level III Short-Term Investments $ 436,426,995 $ 436,426,995 $ — $ — Exchange-Traded Futures Contracts Foreign Contracts (1,866,820 ) (1,866,820 ) — — United States Contracts (12,621,164 ) (12,621,164 ) — — During the year ended December 31, 2018, there were no transfers between Level I and Level II. The following table summarizes the valuation of USCI’s securities at December 31, 2017 using the fair value hierarchy: At December 31, 2017 Total Level I Level II Level III Short-Term Investments $ 441,986,578 $ 441,986,578 $ — $ — Exchange-Traded Futures Contracts Foreign Contracts 1,609,317 1,609,317 — — United States Contracts 5,263,653 5,263,653 — — During the year ended December 31, 2017, there were no transfers between Level I and Level II. The following table summarizes the valuation of CPER’s securities at December 31, 2018 using the fair value hierarchy: At December 31, 2018 Total Level I Level II Level III Short-Term Investments $ 9,657,426 $ 9,657,426 $ — $ — Exchange-Traded Futures Contracts United States Contracts (903,475 ) (903,475 ) — — During the year ended December 31, 2018, there were no transfers between Level I and Level II. The following table summarizes the valuation of CPER’s securities at December 31, 2017 using the fair value hierarchy: At December 31, 2017 Total Level I Level II Level III Short-Term Investments $ 9,590,067 $ 9,590,067 $ — $ — Exchange-Traded Futures Contracts United States Contracts 881,938 881,938 — — During the year ended December 31, 2017, there were no transfers between Level I and Level II. As noted above, as of the filing of this annual report on Form 10-K, USAG is no longer issuing shares and has liquidated and distributed all proceeds to shareholders. As a result, there is no information available as of December 31, 2018. The following table summarizes the valuation of USAG’s securities at December 31, 2017 using the fair value hierarchy: At December 31, 2017 Total Level I Level II Level III Short-Term Investments $ 1,643,759 $ 1,643,759 $ — $ — Exchange-Traded Futures Contracts Foreign Contracts (1,314 ) (1,314 ) — — United States Contracts 189 189 — — During the year ended December 31, 2017, there were no transfers between Level I and Level II. The Trust and each Trust Series have adopted the provisions of Accounting Standards Codification 815 — Derivatives and Hedging, which require presentation of qualitative disclosures about objectives and strategies for using derivatives, quantitative disclosures about fair value amounts and gains and losses on derivatives. Fair Value of Derivative Instruments Held by USCI Derivatives not Accounted for as Hedging Instruments Statements of Financial Condition Location Fair Value At December 31, 2018 Fair Value At December 31, 2017 Futures - Commodity Contracts Assets $ (14,487,984 ) $ 6,872,970 Fair Value of Derivative Instruments Held by CPER Derivatives not Accounted for as Hedging Instruments Statements of Financial Condition Location Fair Value At December 31, 2018 Fair Value At December 31, 2017 Futures - Commodity Contracts Assets $ (903,475 ) $ 881,938 Fair Value of Derivative Instruments Held by USAG Derivatives not Accounted for as Hedging Instruments Statements of Financial Condition Location Fair Value At December 31, 2018 (In Liquidation)* Fair Value At December 31, 2017 Futures - Commodity Contracts Assets $ — $ (1,125 ) * USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018. The Effect of Derivative Instruments on the Statements of Operations of USCI For the year ended December 31, 2018 For the year ended December 31, 2017 For the year ended December 31, 2016 Derivatives not Accounted for as Hedging Instruments Location of Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Futures - Commodity Contracts Realized gain (loss) on closed positions $ (54,710,680 ) $ 22,989,718 $ (22,063,913 ) Change in unrealized gain (loss) on open positions $ (21,360,954 ) $ 4,817,510 $ 10,637,687 The Effect of Derivative Instruments on the Statements of Operations of CPER For the year ended December 31, 2018 For the year ended December 31, 2017 For the year ended December 31, 2016 Derivatives not Accounted for as Hedging Instruments Location of Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Futures - Commodity Contracts Realized gain (loss) on closed positions $ (1,318,188 ) $ 1,468,825 $ (19,600 ) Change in unrealized gain (loss) on open positions $ (1,785,413 ) $ 793,363 $ 269,200 The Effect of Derivative Instruments on the Statements of Operations of USAG For the year ended December 31, 2018 (In Liquidation)* For the year ended December 31, 2017 For the year ended December 31, 2016 Derivatives not Accounted for as Hedging Instruments Location of Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Futures - Commodity Contracts Realized gain (loss) on closed positions $ (181,039 ) $ (238,006 ) $ 26,386 Change in unrealized gain (loss) on open positions $ 1,125 $ 88,575 $ (95,857 ) * USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.

RECENT ACCOUNTING PRONOUNCEMENT

RECENT ACCOUNTING PRONOUNCEMENTS	12 Months Ended
	Dec. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	NOTE 10 – RECENT ACCOUNTING PRONOUNCEMENTS In August 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2015-14, Revenue from Contracts with Customers, modifying ASU 2014-09. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2015-14 is effective for fiscal years beginning on or after December 15, 2016, and interim periods within those annual periods. Early application is permitted. At this time, management does not believe there will be any impact to the Fund’s financial statements. New Accounting Pronouncements In November 2016, the FASB issued Accounting Standards Update No. 2016-18, “Statement of Cash Flows (Topic 230): Restricted Cash” (“ASU 2016-18”), which amends ASC 230 to provide guidance on the classification and presentation of changes in restricted cash and restricted cash equivalents on the statement of cash flows. The ASU is effective for annual periods beginning after December 15, 2017, and interim periods within those annual periods. At this time, management has evaluated the implications of these changes on the financial statements and adopted with no material impact.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	NOTE 11 – SUBSEQUENT EVENTS The Trust and each Trust Series have performed an evaluation of subsequent events through the date the financial statements were issued. This evaluation did not result in any subsequent events that necessitated disclosures and/or adjustments.

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") as detailed in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification. Each Trust Series is an investment company and follows the accounting and reporting guidance in FASB Topic 946. The Trust financial statements included its respective series of funds financial statements including UCCO, USCI, CPER and USAG through December 31, 2018.
Revenue Recognition	Revenue Recognition Commodity futures contracts, forward contracts, physical commodities and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the financial statements. Changes in the unrealized gains or losses between periods are reflected in the statements of operations. Each Trust Series earns income on funds held at the custodian or a futures commission merchant (“FCM”) at prevailing market rates earned on such investments.
Brokerage Commissions	Brokerage Commissions Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.
Income Taxes	Income Taxes The Trust Series are not subject to federal income taxes; each investor reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return. In accordance with U.S. GAAP, each Trust Series is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. Each Trust Series files an income tax return in the U.S. federal jurisdiction and may file income tax returns in various U.S. states. None of the Trust Series is subject to income tax return examinations by major taxing authorities for years before 2015. The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in each Trust Series recording a tax liability that reduces net assets. However, each Trust Series' conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. Each Trust Series recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the year ended December 31, 2018 for any Trust Series.
Creations and Redemptions	Creations and Redemptions Effective as of May 1, 2012, Authorized Participants may purchase Creation Baskets or redeem Redemption Baskets for USCI, CPER and USAG only in blocks of 50,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed. As noted above, as of the filing of this Annual Report on Form 10-K, USAG is no longer issuing shares. Each Trust Series receives or pays the proceeds from shares sold or redeemed within two business days after the trade date of the purchase or redemption. The amounts due from Authorized Participants are reflected in each Trust Series' statements of financial condition as receivable for shares sold and amounts payable to Authorized Participants upon redemption are reflected as payable for shares redeemed.
Trust Capital and Allocation of Income and Losses	Trust Capital and Allocation of Income and Losses Profit or loss shall be allocated among the shareholders of each Trust Series in proportion to the number of shares each investor holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the Trust Agreement .
Calculation of NAV	Calculation of Per Share NAV Each Trust Series' per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing that amount by the total number of shares outstanding. Each Trust Series uses the closing prices on the relevant Futures Exchanges (as defined in Note 3 below) of the Applicable Benchmark Component Futures Contracts (as defined in Note 3 below) that at any given time make up the Applicable Index (as defined in Note 3 below) (determined at the earlier of the close of such exchange or 2:30 p.m. New York time) for the contracts traded on the Futures Exchanges, but calculates or determines the value of all other investments of each Trust Series using market quotations, if available, or other information customarily used to determine the fair value of such investments.
Net Income (Loss) Per Share	Net Income (Loss) Per Share Net income (loss) per share is the difference between the per share NAV at the beginning of each period and at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. As of December 31, 2018, USCF held 5 shares of USCI and 40 shares of CPER. As noted above, as of the filing of this Annual Report on Form 10-K, USAG is no longer issuing shares.
Offering Costs	Offering Costs Offering costs incurred in connection with the registration of shares prior to the commencement of the offering are borne by USCF. Offering costs incurred in connection with the registration of additional shares after the commencement of the offering are borne by each Trust Series. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. Costs borne by the Trust Series after the commencement of an offering are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.
Cash Equivalents	Cash Equivalents Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of six months or less.
Reclassification	Reclassification Certain amounts in the accompanying financial statements were reclassified to conform to the current presentation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

CONTRACTS AND AGREEMENTS (Table

CONTRACTS AND AGREEMENTS (Tables)	12 Months Ended
	Dec. 31, 2018
Contractors [Abstract]
Brokerage Commissions	USCI For the Year Ended December 31, 2018 For the Year Ended December 31, 2017 For the Year Ended December 31, 2016 Total commissions accrued to brokers $ 539,884 $ 527,610 $ 776,649 Total commissions as annualized percentage of average total net assets 0.09 % 0.10 % 0.13 % Commissions accrued as a result of rebalancing $ 508,021 $ 505,199 $ 752,519 Percentage of commissions accrued as a result of rebalancing 94.10 % 95.75 % 96.89 % Commissions accrued as a result of creation and redemption activity $ 31,863 $ 22,411 $ 24,130 Percentage of commissions accrued as a result of creation and redemption activity 5.90 % 4.25 % 3.11 % The increase in total commissions accrued to brokers for the year ended December 31, 2018, compared to the year ended December 31, 2017, was due primarily to a higher number of contracts held and traded. The decrease in total commissions accrued to brokers for the year ended December 31, 2017, compared to the year ended December 31, 2016, was due primarily to lower number of futures contracts being held and traded. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters. CPER For the Year Ended December 31, 2018 For the Year Ended December 31, 2017 For the Year Ended December 31, 2016 Total commissions accrued to brokers $ 5,181 $ 5,461 $ 1,628 Total commissions as annualized percentage of average total net assets 0.04 % 0.05 % 0.06 % Commissions accrued as a result of rebalancing $ 4,205 $ 4,390 $ 1,455 Percentage of commissions accrued as a result of rebalancing 81.16 % 80.39 % 89.37 % Commissions accrued as a result of creation and redemption activity $ 976 $ 1,071 $ 173 Percentage of commissions accrued as a result of creation and redemption activity 18.84 % 19.61 % 10.63 % The decrease in total commissions accrued to brokers for the year ended December 31, 2018, compared to the year ended December 31, 2017, was due primarily to a lower number of contracts held and traded. The increase in total commissions accrued to brokers for the year ended December 31, 2017, compared to the year ended December 31, 2016, was due primarily to higher number of futures contracts being held and traded. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters. USAG For the Year Ended December 31, 2018 (In Liquidation)* For the Year Ended December 31, 2017 For the Year Ended December 31, 2016 Total commissions accrued to brokers $ 1,498 $ 1,923 $ 2,150 Total commissions as annualized percentage of average total net assets 0.09 % 0.10 % 0.11 % Commissions accrued as a result of rebalancing $ 1,498 $ 1,923 $ 2,150 Percentage of commissions accrued as a result of rebalancing 100.00 % 100.00 % 100.00 % Commissions accrued as a result of creation and redemption activity $ — $ — $ — Percentage of commissions accrued as a result of creation and redemption activity —% —% —% * USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.

FINANCIAL HIGHLIGHTS (Tables)

FINANCIAL HIGHLIGHTS (Tables)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Per Unit Performance Data and Other Supplemental Financial Data for Usci, Cper, Usag and Usmi	The following tables present per share performance data and other supplemental financial data for each Trust Series for the years ended December 31, 2018, 2017 and 2016 for the shareholders. This information has been derived from information presented in the financial statements. USCI Year ended December 31, 2018 Year ended December 31, 2017 Year ended December 31, 2016 Per Share Operating Performance: Net asset value, beginning of year $ 42.48 $ 40.02 $ 40.52 Total income (loss) (4.56 ) 2.87 (0.07 ) Total expenses (0.43 ) (0.41 ) (0.43 ) Net increase (decrease) in net asset value (4.99 ) 2.46 (0.50 ) Net asset value, end of year $ 37.49 $ 42.48 $ 40.02 Total Return (11.75 )% 6.15 % (1.23 )% Ratios to Average Net Assets Total income (loss) (11.33 )% 6.17 % (1.57 )% Management fees 0.80 %* 0.80 %* 0.80 %* Total expenses excluding management fees 0.23 % 0.24 % 0.23 % Expenses waived — %* — %* — %* Net expenses excluding management fees 0.23 % 0.24 % 0.23 % Net income (loss) (12.36 )% 5.14 % (2.60 )% * Effective January 1, 2016, USCF permanently lowered the management fee to 0.80% (80 basis points) per annum of average daily total net assets for USCI. CPER Year ended December 31, 2018 Year ended December 31, 2017 Year ended December 31, 2016 Per Share Operating Performance: Net asset value, beginning of year $ 21.05 $ 16.36 $ 14.24 Total income (loss) (4.46 ) 4.83 2.24 Net expenses (0.15 ) (0.14 ) (0.12 ) Net increase (decrease) in net asset value (4.61 ) 4.69 2.12 Net asset value, end of year $ 16.44 $ 21.05 $ 16.36 Total Return (21.90 )% 28.67 % 14.89 % Ratios to Average Net Assets Total income (loss) (24.49 )% 22.70 % 8.84 % Management fees 0.65 %* 0.65 %* 0.65 %* Total expenses excluding management fees 0.58 % 0.54 % 2.71 % Expenses waived (0.43 )%*† (0.39 )%*† (2.56 )%*† Net expenses excluding management fees 0.15 % 0.15 % 0.15 % Net income (loss) (25.29 )% 21.90 % 8.04 % * Effective January 1, 2016, USCF permanently lowered the management fee to 0.65% (65 basis points) per annum of average daily total net assets for CPER. † USCF paid certain expenses on a discretionary basis typically borne by CPER where expenses exceeded 0.15% (15 basis points) of CPER’s NAV, on an annualized basis. USCF has no obligation to continue such payments into subsequent periods. USAG Year ended December 31, 2018 (In Liquidation)* Year ended December 31, 2017 Year ended December 31, 2016 Per Share Operating Performance: Net asset value, beginning of year $ 17.51 $ 19.01 $ 19.80 Total income (loss) (1.62 ) (1.35 ) (0.63 ) Net expenses (0.10 ) (0.15 ) (0.16 ) Net increase (decrease) in net asset value (1.72 ) (1.50 ) (0.79 ) Net asset value, end of year $ 15.79 ** $ 17.51 $ 19.01 Total Return (9.82 )% (7.89 )% (3.99 )% Ratios to Average Net Assets Total income (loss) (9.43 )% (7.30 )% (3.17 )% Management fees 0.65 %*** 0.65 %*** 0.65 %*** Total expenses excluding management fees 2.44 % 2.62 % 3.79 % Expenses waived (2.29 )%***† (2.47 )%***† (3.64 )%***† Net expenses excluding management fees 0.15 % 0.15 % 0.15 % Net income (loss) (9.98 )% (8.10 )% (3.97 )% * USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018. ** Net asset value as of September 6, 2018. *** Effective January 1, 2016, USCF permanently lowered the management fee to 0.65% (65 basis points) per annum of average daily total net assets for USAG. † USCF paid certain expenses on a discretionary basis typically borne by USAG where expenses exceeded 0.15% (15 basis points) of USAG’s NAV, on an annualized basis. USCF has no obligation to continue such payments into subsequent periods.

QUARTERLY FINANCIAL DATA (Una_2

QUARTERLY FINANCIAL DATA (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Financial Information	The following summarized (unaudited) quarterly financial information presents the results of operations and other data for the three-month periods ended March 31, June 30, September 30 and December 31, 2018 and 2017. USCI First Quarter 2018 Second Quarter 2018 Third Quarter 2018 Fourth Quarter 2018 Total Income (Loss) $ 4,264,134 $ 14,855,407 $ (19,156,279 ) $ (65,771,228 ) Total Expenses 1,391,035 1,536,430 1,639,497 1,396,043 Net Income (Loss) $ 2,873,099 $ 13,318,977 $ (20,795,776 ) $ (67,167,271 ) Net Income (Loss) per Share $ 0.24 $ 0.98 $ (1.24 ) $ (4.97 ) First Quarter 2017 Second Quarter 2017 Third Quarter 2017 Fourth Quarter 2017 Total Income (Loss) $ (9,365,854 ) $ (9,718,956 ) $ 21,340,388 $ 29,585,153 Total Expenses 1,431,730 1,424,635 1,186,116 1,307,330 Net Income (Loss) $ (10,797,584 ) $ (11,143,591 ) $ 20,154,272 $ 28,277,823 Net Income (Loss) per Share $ (0.81 ) $ (0.75 ) $ 1.62 $ 2.40 CPER First Quarter 2018 Second Quarter 2018 Third Quarter 2018 Fourth Quarter 2018 Total Income (Loss) $ (1,178,835 ) $ (389,444 ) $ (582,529 ) $ (747,096 ) Total Expenses 35,759 33,533 37,461 39,211 Expense Waivers (8,269 ) (10,931 ) (15,472 ) (16,628 ) Net Expenses 27,490 22,602 21,989 22,583 Net Income (Loss) $ (1,206,325 ) $ (412,046 ) $ (604,518 ) $ (769,679 ) Net Income (Loss) per Share $ (1.75 ) $ (0.58 ) $ (1.12 ) $ (1.16 ) First Quarter 2017 Second Quarter 2017 Third Quarter 2017 Fourth Quarter 2017 Total Income (Loss) $ 392,246 $ 114,427 $ 830,774 $ 1,009,945 Total Expenses 36,305 34,700 29,845 22,102 Expense Waivers (17,779 ) (7,307 ) (10,493 ) (4,574 ) Net Expenses 18,526 27,393 19,352 17,528 Net Income (Loss) $ 373,720 $ 87,034 $ 811,422 $ 992,417 Net Income (Loss) per Share $ 0.95 $ 0.19 $ 1.47 $ 2.08 USAG First Quarter 2018 Second Quarter 2018 Third Quarter 2018* Fourth Quarter 2018* Total Income (Loss) $ (13,280 ) $ (65,797 ) $ (82,852 ) $ — Total Expenses 14,429 12,956 8,792 — Expense Waivers (10,899 ) (9,525 ) (6,160 ) — Net Expenses 3,530 3,431 2,632 — Net Income (Loss) $ (16,810 ) $ (69,228 ) $ (85,484 ) $ — Net Income (Loss) per Share $ (0.17 ) $ (0.69 ) $ (0.86 ) $ — First Quarter 2017 Second Quarter 2017 Third Quarter 2017 Fourth Quarter 2017 Total Income (Loss) $ (10,243 ) $ (13,891 ) $ (113,661 ) $ 2,843 Total Expenses 22,497 7,643 17,981 12,232 Expense Waivers (18,575 ) (3,979 ) (14,271 ) (8,708 ) Net Expenses 3,922 3,664 3,710 3,524 Net Income (Loss) $ (14,165 ) $ (17,555 ) $ (117,371 ) $ (681 ) Net Income (Loss) per Share $ (0.14 ) $ (0.18 ) $ (1.17 ) $ (0.01 ) * USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.

FAIR VALUE OF FINANCIAL INSTR_2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Valuation of Usci's, Cper's, Usag's and Usmi's Securities Using Fair Value Hierarchy	The following table summarizes the valuation of USCI’s securities at December 31, 2018 using the fair value hierarchy: At December 31, 2018 Total Level I Level II Level III Short-Term Investments $ 436,426,995 $ 436,426,995 $ — $ — Exchange-Traded Futures Contracts Foreign Contracts (1,866,820 ) (1,866,820 ) — — United States Contracts (12,621,164 ) (12,621,164 ) — — During the year ended December 31, 2018, there were no transfers between Level I and Level II. The following table summarizes the valuation of USCI’s securities at December 31, 2017 using the fair value hierarchy: At December 31, 2017 Total Level I Level II Level III Short-Term Investments $ 441,986,578 $ 441,986,578 $ — $ — Exchange-Traded Futures Contracts Foreign Contracts 1,609,317 1,609,317 — — United States Contracts 5,263,653 5,263,653 — — During the year ended December 31, 2017, there were no transfers between Level I and Level II. The following table summarizes the valuation of CPER’s securities at December 31, 2018 using the fair value hierarchy: At December 31, 2018 Total Level I Level II Level III Short-Term Investments $ 9,657,426 $ 9,657,426 $ — $ — Exchange-Traded Futures Contracts United States Contracts (903,475 ) (903,475 ) — — During the year ended December 31, 2018, there were no transfers between Level I and Level II. The following table summarizes the valuation of CPER’s securities at December 31, 2017 using the fair value hierarchy: At December 31, 2017 Total Level I Level II Level III Short-Term Investments $ 9,590,067 $ 9,590,067 $ — $ — Exchange-Traded Futures Contracts United States Contracts 881,938 881,938 — — During the year ended December 31, 2017, there were no transfers between Level I and Level II. As noted above, as of the filing of this annual report on Form 10-K, USAG is no longer issuing shares and has liquidated and distributed all proceeds to shareholders. As a result, there is no information available as of December 31, 2018. The following table summarizes the valuation of USAG’s securities at December 31, 2017 using the fair value hierarchy: At December 31, 2017 Total Level I Level II Level III Short-Term Investments $ 1,643,759 $ 1,643,759 $ — $ — Exchange-Traded Futures Contracts Foreign Contracts (1,314 ) (1,314 ) — — United States Contracts 189 189 — —
Fair Value of Derivative Instruments Held by Usci, Cper, Usag and Usmi	Fair Value of Derivative Instruments Held by USCI Derivatives not Accounted for as Hedging Instruments Statements of Financial Condition Location Fair Value At December 31, 2018 Fair Value At December 31, 2017 Futures - Commodity Contracts Assets $ (14,487,984 ) $ 6,872,970 Fair Value of Derivative Instruments Held by CPER Derivatives not Accounted for as Hedging Instruments Statements of Financial Condition Location Fair Value At December 31, 2018 Fair Value At December 31, 2017 Futures - Commodity Contracts Assets $ (903,475 ) $ 881,938 Fair Value of Derivative Instruments Held by USAG Derivatives not Accounted for as Hedging Instruments Statements of Financial Condition Location Fair Value At December 31, 2018 (In Liquidation)* Fair Value At December 31, 2017 Futures - Commodity Contracts Assets $ — $ (1,125 ) * USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.
Effect of Derivative Instruments on Statements of Operations of Usci, Cper, Usag and Usmi	The Effect of Derivative Instruments on the Statements of Operations of USCI For the year ended December 31, 2018 For the year ended December 31, 2017 For the year ended December 31, 2016 Derivatives not Accounted for as Hedging Instruments Location of Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Futures - Commodity Contracts Realized gain (loss) on closed positions $ (54,710,680 ) $ 22,989,718 $ (22,063,913 ) Change in unrealized gain (loss) on open positions $ (21,360,954 ) $ 4,817,510 $ 10,637,687 The Effect of Derivative Instruments on the Statements of Operations of CPER For the year ended December 31, 2018 For the year ended December 31, 2017 For the year ended December 31, 2016 Derivatives not Accounted for as Hedging Instruments Location of Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Futures - Commodity Contracts Realized gain (loss) on closed positions $ (1,318,188 ) $ 1,468,825 $ (19,600 ) Change in unrealized gain (loss) on open positions $ (1,785,413 ) $ 793,363 $ 269,200 The Effect of Derivative Instruments on the Statements of Operations of USAG For the year ended December 31, 2018 (In Liquidation)* For the year ended December 31, 2017 For the year ended December 31, 2016 Derivatives not Accounted for as Hedging Instruments Location of Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Realized Gain (Loss) on Derivatives Recognized in Income Change in Unrealized Gain (Loss) on Derivatives Recognized in Income Futures - Commodity Contracts Realized gain (loss) on closed positions $ (181,039 ) $ (238,006 ) $ 26,386 Change in unrealized gain (loss) on open positions $ 1,125 $ 88,575 $ (95,857 ) * USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.

ORGANIZATION AND BUSINESS (Addi

ORGANIZATION AND BUSINESS (Additional Information) (Details) - $ / Basket	Dec. 31, 2018	Mar. 31, 2018	Nov. 15, 2011	Nov. 10, 2010	Aug. 10, 2010
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets					1,000
United States Commodity Index Fund [Member] | Creation Baskets [Member] | Effective as of May 1, 2012 [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of Units per basket	50,000
United States Commodity Index Fund [Member] | Marketing Agent [Member] | Prior to May 1, 2012 [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of Units per basket	100,000
United States Commodity Index Fund [Member] | Redemption Baskets [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets	350
United States Copper Index Fund [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets		1,000	1,000	1,000
United States Copper Index Fund [Member] | Creation Baskets [Member] | Effective as of May 1, 2012 [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of Units per basket	50,000

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details)	12 Months Ended
	Dec. 31, 2018$ / Basketshares
Significant Accounting Policies [Line Items]
Cash equivalents maturity period	0 years
United States Commodity Index Fund [Member]
Significant Accounting Policies [Line Items]
Weighted average shares outstanding	5
United States Copper Index Fund [Member]
Significant Accounting Policies [Line Items]
Weighted average shares outstanding	40
Creation Baskets [Member] | Effective as of May 1, 2012 [Member] | United States Commodity Index Fund [Member]
Significant Accounting Policies [Line Items]
Number Of Units Per Basket | $ / Basket	50,000

TRUST SERIES (Additional Inform

TRUST SERIES (Additional Information) (Details)

Sep. 14, 2011shares

Sep. 06, 2011

Aug. 10, 2010USD ($)$ / shares$ / Basketshares

Nov. 15, 2011USD ($)$ / shares$ / Basketshares

Sep. 19, 2011shares

Jul. 30, 2010

Dec. 21, 2009USD ($)shares

Dec. 31, 2018USD ($)$ / shares

Mar. 31, 2018USD ($)$ / Basket

Dec. 31, 2017USD ($)$ / shares

Dec. 31, 2016$ / shares

Dec. 31, 2015$ / shares

Apr. 13, 2012$ / shares$ / Basket

Nov. 10, 2010USD ($)$ / Basket

Capital Unit [Line Items]

Sponsor capital contribution

$ 1,000

$ 1,000

Capital contribution to trust series

$ 1,000

Units acquisition | shares

20

Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / Basket

1,000

Partner sponsor units description

On November 10, 2010, the Trust transferred $1,000 to each of USMI, USAG and CPER, which was deemed a capital contribution to each series. On November 14, 2011, USCF received 40 Sponsor Shares of CPER in exchange for the previously received capital contribution, representing a beneficial interest in CPER. On December 7, 2011, USCF redeemed the 40 Sponsor Shares of CPER and purchased 40 shares of CPER in the open market. On April 13, 2012, USCF received 40 Sponsor Shares of USAG in exchange for the previously received capital contribution, representing a beneficial interest in USAG. On June 28, 2012, USCF redeemed the 40 Sponsor Shares of USAG and on October 3, 2012, purchased 5 shares of USAG on the open market.

Future Contract Rebalance Target Weightage

7.14%

United States Commodity Index Fund [Member]

Capital Unit [Line Items]

Sponsor capital contribution

$ 0

$ 0

$ 3,000

Units acquisition | shares

20

5

Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission

50,000,000

Initial offering price per unit NAV | $ / shares

$ 50

$ 37.49

$ 42.48

$ 40.02

$ 40.52

Number of units issued | shares

100,000

Value of unit issued

$ 5,000,000

Number of registered units

100,000

United States Commodity Index Fund [Member] | Futures Contracts [Member]

Capital Unit [Line Items]

Future contract held

16,259

United States Commodity Index Fund [Member] | Futures Contracts [Member] | NYMEX [Member]

Capital Unit [Line Items]

Future contract held

2,253

United States Commodity Index Fund [Member] | Futures Contracts [Member] | Ice Futures [Member]

Capital Unit [Line Items]

Future contract held

2,276

United States Commodity Index Fund [Member] | Futures Contracts [Member] | Chicago Board of Trade [Member]

Capital Unit [Line Items]

Future contract held

4,037

United States Commodity Index Fund [Member] | Futures Contracts [Member] | Chicago Mercantile Exchange [Member]

Capital Unit [Line Items]

Future contract held

1,121

United States Commodity Index Fund [Member] | Futures Contracts [Member] | London Metal Exchange [Member]

Capital Unit [Line Items]

Future contract held

5,819

United States Commodity Index Fund [Member] | Futures Contracts [Member] | Commodity Exchange Inc [Member]

Capital Unit [Line Items]

Future contract held

753

United States Agriculture Index Fund [Member]

Capital Unit [Line Items]

Sponsor capital contribution

$ 0

[1]

$ 0

Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission

20,000,000

Initial offering price per unit NAV | $ / shares

$ 0

[1]

$ 17.51

[1]

19.01

[1]

19.80

[1]

$ 25

Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / Basket

1,000

United States Copper Index Fund [Member]

Capital Unit [Line Items]

Sponsor capital contribution

$ 0

$ 0

Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission

30,000,000

Initial offering price per unit NAV | $ / shares

$ 25

$ 16.44

$ 21.05

$ 16.36

$ 14.24

Number of units issued | shares

100,000

Value of unit issued

$ 2,500,000

Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / Basket

1,000

1,000

1,000

[1]

USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.

FEES PAID BY EACH TRUST SERIE_2

FEES PAID BY EACH TRUST SERIES AND RELATED PARTY TRANSACTIONS (Additional Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fees Paid and Related Party Transactions [Line Items]
Trustee annual fee	$ 3,000
Directors and Officers Liability Insurance [Member]
Fees Paid and Related Party Transactions [Line Items]
Noninterest Expense Directors Fees	$ 521,689	$ 536,375
United States Commodity Index Fund [Member]
Fees Paid and Related Party Transactions [Line Items]
Percentage of average daily net assets paid	0.95%
Noninterest Expense Directors Fees	$ 91,761	69,558
Estimated investor tax reporting cost	$ 675,000
United States Commodity Index Fund [Member] | Effective January 1, 2016 [Member]
Fees Paid and Related Party Transactions [Line Items]
Percentage of average daily net assets paid	0.80%
United States Copper Index Fund [Member]
Fees Paid and Related Party Transactions [Line Items]
Noninterest Expense Directors Fees	$ 2,100	1,823
Estimated investor tax reporting cost	$ 60,000
Costs and expenses annual limit for reimbursement	0.15%
Expense waiver	$ 51,300
United States Agriculture Index Fund [Member]
Fees Paid and Related Party Transactions [Line Items]
Noninterest Expense Directors Fees	917	$ 1,144
Estimated investor tax reporting cost	25,000
Expense waiver	$ 26,584
United States Agriculture Index Fund [Member] | Effective January 1, 2016 [Member]
Fees Paid and Related Party Transactions [Line Items]
Percentage of average daily net assets paid	0.65%

CONTRACTS AND AGREEMENTS (Broke

CONTRACTS AND AGREEMENTS (Brokerage Commission) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
United States Commodity Index Fund [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Brokerage commissions	$ 539,884		$ 527,610	$ 776,649
Brokerage commissions as a percentage of average daily net assets	0.09%		0.10%	0.13%
United States Commodity Index Fund [Member] | Rebalancing Investments Transaction [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Brokerage commissions	$ 508,021		$ 505,199	$ 752,519
Brokerage commissions as a percentage of average daily net assets	94.10%		95.75%	96.89%
United States Commodity Index Fund [Member] | Creation and Redemption Activity [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Brokerage commissions	$ 31,863		$ 22,411	$ 24,130
Brokerage commissions as a percentage of average daily net assets	5.90%		4.25%	3.11%
United States Copper Index Fund [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Brokerage commissions	$ 5,181		$ 5,461	$ 1,628
Brokerage commissions as a percentage of average daily net assets	0.04%		0.05%	0.06%
United States Copper Index Fund [Member] | Rebalancing Investments Transaction [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Brokerage commissions	$ 4,205		$ 4,390	$ 1,455
Brokerage commissions as a percentage of average daily net assets	81.16%		80.39%	89.37%
United States Copper Index Fund [Member] | Creation and Redemption Activity [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Brokerage commissions	$ 976		$ 1,071	$ 173
Brokerage commissions as a percentage of average daily net assets	18.84%		19.61%	10.63%
United States Agriculture Index Fund [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Brokerage commissions	$ 1,498	[1]	$ 1,923	$ 2,150
Brokerage commissions as a percentage of average daily net assets	0.09%		0.10%	0.11%
United States Agriculture Index Fund [Member] | Rebalancing Investments Transaction [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Brokerage commissions	$ 1,498		$ 1,923	$ 2,150
Brokerage commissions as a percentage of average daily net assets	100.00%		100.00%	100.00%
United States Agriculture Index Fund [Member] | Creation and Redemption Activity [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Brokerage commissions	$ 0		$ 0	$ 0
Brokerage commissions as a percentage of average daily net assets	0.00%		0.00%	0.00%
[1]	USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.

CONTRACTS AND AGREEMENTS (Addit

CONTRACTS AND AGREEMENTS (Additional Information) (Details)	12 Months Ended
	Dec. 31, 2018USD ($)$ / Basket
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Annual transfer agency services fee	$ 20,000
Management fee paid to SummerHaven by USCF	plus an annual fee of 0.06% of the average daily total net assets of each Trust Series.
Management fee description	for USCI, the fee was equal to the percentage fees paid to USCF minus 0.14%, with that result multiplied by 0.5, minus 0.06% to arrive at the actual fee paid. Prior to May 1, 2018, for CPER and USAG, the fee was equal to the percentage fees paid to USCF minus 0.18%, with that result multiplied by 0.5, minus 0.6% to arrive at the actual fee paid.
Licensing Agreements [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Annual licensing fee	$ 15,000
Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Transaction fees per transaction | $ / Basket	15
Commissions per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts | $ / Basket	8
Minimum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$ 75,000
Transaction fees per transaction | $ / Basket	7
Commissions per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts | $ / Basket	7
For the first $500 million [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.06%
For the first $500 million [Member] | Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$ 500,000,000
Combined net assets greater than $500 million but less than $1 billion [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.0465%
Combined net assets greater than $500 million but less than $1 billion [Member] | Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$ 1,000,000,000
Combined net assets greater than $500 million but less than $1 billion [Member] | Minimum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$ 500,000,000
Combined net assets exceed $1 billion [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.035%
Combined net assets exceed $1 billion [Member] | Minimum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$ 1,000,000,000
Marketing Agreement [Member] | Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	10.00%
Marketing Agreement [Member] | Minimum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.04%
Marketing Agreement [Member] | On each Trust Series' assets up to 3 billion [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.06%
Marketing Agreement [Member] | On each Trust Series' assets up to 3 billion [Member] | Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$ 3,000,000,000
Marketing Agreement [Member] | On each Trust Series' assets in excess of $3 billion [Member] | Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$ 3,000,000,000

FINANCIAL INSTRUMENTS, OFF-BA_2

FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES (Additional Information) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
United States Commodity Index Fund [Member]
Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items]
Cash deposits and investments in Treasuries	$ 472,109,213	$ 488,389,644
Deposits, Money Market Deposits	6,400,000	9,000,000
United States Copper Index Fund [Member]
Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items]
Cash deposits and investments in Treasuries	11,556,460	9,107,982
Deposits, Money Market Deposits	$ 855,000	990,000
United States Agriculture Index Fund [Member]
Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items]
Cash deposits and investments in Treasuries		1,453,032
Deposits, Money Market Deposits		$ 300,000

FINANCIAL HIGHLIGHTS (Per Unit

FINANCIAL HIGHLIGHTS (Per Unit Performance Data and Other Supplemental Financial Data) (Parenthetical) (Details)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
United States Copper Index Fund [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Percentage of average daily net assets paid monthly, waiver expense	[1],[2]	0.43%	0.39%	2.56%
Percentage of Expenses Exceeded		0.15%
United States Copper Index Fund [Member] | Effective January 1, 2016 [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Percentage of average daily net assets paid monthly, waiver expense		0.65%
United States Agriculture Index Fund [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Percentage of average daily net assets paid monthly, waiver expense	[3],[4]	2.29%	2.47%	3.64%
Percentage of Expenses Exceeded		0.15%
United States Agriculture Index Fund [Member] | Effective January 1, 2016 [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Percentage of average daily net assets paid monthly, waiver expense		0.65%
United States Commodity Index Fund [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Percentage of average daily net assets paid monthly, waiver expense	[5]	(8212.00%)	(8212.00%)	(8212.00%)
United States Commodity Index Fund [Member] | Effective January 1, 2016 [Member]
Average Sales Price and Production Costs Per Unit of Production [Line Items]
Percentage of average daily net assets paid monthly, waiver expense		0.80%
[1]	Effective January 1, 2016, USCF permanently lowered the management fee to 0.65% (65 basis points) per annum of average daily total net assets for CPER.
[2]	USCF paid certain expenses on a discretionary basis typically borne by CPER where expenses exceeded 0.15% (15 basis points) of CPER’s NAV, on an annualized basis. USCF has no obligation to continue such payments into subsequent periods.
[3]	Effective January 1, 2016, USCF permanently lowered the management fee to 0.65% (65 basis points) per annum of average daily total net assets for USAG.
[4]	USCF paid certain expenses on a discretionary basis typically borne by USAG where expenses exceeded 0.15% (15 basis points) of USAG’s NAV, on an annualized basis. USCF has no obligation to continue such payments into subsequent periods.
[5]	Effective January 1, 2016, USCF permanently lowered the management fee to 0.80% (80 basis points) per annum of average daily total net assets for USCI.

FINANCIAL HIGHLIGHTS (Per Uni_2

FINANCIAL HIGHLIGHTS (Per Unit Performance Data and Other Supplemental Financial Data) (Details) - $ / shares		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
United States Commodity Index Fund [Member]
Per Share Operating Performance:
Net asset value, beginning of period (in dollars per share)		$ 42.48	$ 40.02	$ 40.52
Total income (loss)		(4.56)	2.87	(0.07)
Total expenses		(0.43)	(0.41)	(0.43)
Net increase (decrease) in net asset value		(4.99)	2.46	(0.50)
Net asset value, end of period (in dollars per share)		$ 37.49	$ 42.48	$ 40.02
Total Return		(11.75%)	6.15%	(1.23%)
Ratios to Average Net Assets
Total income (loss)		(11.33%)	6.17%	(1.57%)
Management fees	[1]	0.80%	0.80%	0.80%
Total expenses excluding management fees		0.23%	0.24%	0.23%
Expenses waived	[1]	8212.00%	8212.00%	8212.00%
Net expenses excluding management fees		0.23%	0.24%	0.23%
Net income (loss)		(12.36%)	5.14%	(2.60%)
United States Copper Index Fund [Member]
Per Share Operating Performance:
Net asset value, beginning of period (in dollars per share)		$ 21.05	$ 16.36	$ 14.24
Total income (loss)		(4.46)	4.83	2.24
Total expenses		(0.15)	(0.14)	(0.12)
Net increase (decrease) in net asset value		(4.61)	4.69	2.12
Net asset value, end of period (in dollars per share)		$ 16.44	$ 21.05	$ 16.36
Total Return		(21.90%)	28.67%	14.89%
Ratios to Average Net Assets
Total income (loss)		(24.49%)	22.70%	8.84%
Management fees	[2]	0.65%	0.65%	0.65%
Total expenses excluding management fees		0.58%	0.54%	2.71%
Expenses waived	[2],[3]	(0.43%)	(0.39%)	(2.56%)
Net expenses excluding management fees		0.15%	0.15%	0.15%
Net income (loss)		(25.29%)	21.90%	8.04%
United States Agriculture Index Fund [Member]
Per Share Operating Performance:
Net asset value, beginning of period (in dollars per share)	[4]	$ 17.51	$ 19.01	$ 19.80
Total income (loss)		(1.62)	(1.35)	(0.63)
Total expenses		(0.10)	(0.15)	(0.16)
Net increase (decrease) in net asset value		(1.72)	(1.50)	(0.79)
Net asset value, end of period (in dollars per share)	[4]	$ 0	$ 17.51	$ 19.01
Total Return		(9.82%)	(7.89%)	(3.99%)
Ratios to Average Net Assets
Total income (loss)		(9.43%)	(7.30%)	(3.17%)
Management fees	[5]	0.65%	0.65%	0.65%
Total expenses excluding management fees		2.44%	2.62%	3.79%
Expenses waived	[5],[6]	(2.29%)	(2.47%)	(3.64%)
Net expenses excluding management fees		0.15%	0.15%	0.15%
Net income (loss)		(9.98%)	(8.10%)	(3.97%)
[1]	Effective January 1, 2016, USCF permanently lowered the management fee to 0.80% (80 basis points) per annum of average daily total net assets for USCI.
[2]	Effective January 1, 2016, USCF permanently lowered the management fee to 0.65% (65 basis points) per annum of average daily total net assets for CPER.
[3]	USCF paid certain expenses on a discretionary basis typically borne by CPER where expenses exceeded 0.15% (15 basis points) of CPER’s NAV, on an annualized basis. USCF has no obligation to continue such payments into subsequent periods.
[4]	USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.
[5]	Effective January 1, 2016, USCF permanently lowered the management fee to 0.65% (65 basis points) per annum of average daily total net assets for USAG.
[6]	USCF paid certain expenses on a discretionary basis typically borne by USAG where expenses exceeded 0.15% (15 basis points) of USAG’s NAV, on an annualized basis. USCF has no obligation to continue such payments into subsequent periods.

QUARTERLY FINANCIAL DATA (Una_3

QUARTERLY FINANCIAL DATA (Unaudited) (Summary of Quarterly Financial Information) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
United States Commodity Index Fund [Member]
Quarterly Financial Data [Line Items]
Total Income (Loss)	$ (65,771,228)	$ (19,156,279)	$ 14,855,407	$ 4,264,134	$ 29,585,153	$ 21,340,388	$ (9,718,956)	$ (9,365,854)	$ (65,807,966)		$ 31,840,731	$ (9,424,153)
Total Expenses	1,396,043	1,639,497	1,536,430	1,391,035	1,307,330	1,186,116	1,424,635	1,431,730	5,963,005		5,349,811	6,215,498
Net income (loss)	$ (67,167,271)	$ (20,795,776)	$ 13,318,977	$ 2,873,099	$ 28,277,823	$ 20,154,272	$ (11,143,591)	$ (10,797,584)	$ (71,770,971)		$ 26,490,920	$ (15,639,651)
Net Income (Loss) per Share	$ (4.97)	$ (1.24)	$ 0.98	$ 0.24	$ 2.40	$ 1.62	$ (0.75)	$ (0.81)	$ (4.99)		$ 2.46	$ (0.50)
United States Copper Index Fund [Member]
Quarterly Financial Data [Line Items]
Total Income (Loss)	$ (747,096)	$ (582,529)	$ (389,444)	$ (1,178,835)	$ 1,009,945	$ 830,774	$ 114,427	$ 392,246	$ (2,897,904)		$ 2,347,392	$ 260,625
Total Expenses	39,211	37,461	33,533	35,759	22,102	29,845	34,700	36,305	145,964		122,952	99,233
Expense waivers	(16,628)	(15,472)	(10,931)	(8,269)	(4,574)	(10,493)	(7,307)	(17,779)	(51,300)		(40,153)	(75,640)
Net expenses	22,583	21,989	22,602	27,490	17,528	19,352	27,393	18,526	94,664		82,799	23,593
Net income (loss)	$ (769,679)	$ (604,518)	$ (412,046)	$ (1,206,325)	$ 992,417	$ 811,422	$ 87,034	$ 373,720	$ (2,992,568)		$ 2,264,593	$ 237,032
Net Income (Loss) per Share	$ (1.16)	$ (1.12)	$ (0.58)	$ (1.75)	$ 2.08	$ 1.47	$ 0.19	$ 0.95	$ (4.61)		$ 4.69	$ 2.12
United States Agriculture Index Fund [Member]
Quarterly Financial Data [Line Items]
Total Income (Loss)	$ 0	$ (82,852)	$ (65,797)	$ (13,280)	$ 2,843	$ (113,661)	$ (13,891)	$ (10,243)	$ (161,929)	[1]	$ (134,952)	$ (62,875)
Total Expenses	0	8,792	12,956	14,429	12,232	17,981	7,643	22,497	36,177	[1]	60,353	88,063
Expense waivers	0	(6,160)	(9,525)	(10,899)	(8,708)	(14,271)	(3,979)	(18,575)	(26,584)	[1]	(45,533)	(72,173)
Net expenses	0	2,632	3,431	3,530	3,524	3,710	3,664	3,922	9,593	[1]	14,820	15,890
Net income (loss)	$ 0	$ (85,484)	$ (69,228)	$ (16,810)	$ (681)	$ (117,371)	$ (17,555)	$ (14,165)	$ (171,522)	[1]	$ (149,772)	$ (78,765)
Net Income (Loss) per Share	$ 0	$ (0.86)	$ (0.69)	$ (0.17)	$ (0.01)	$ (1.17)	$ (0.18)	$ (0.14)	$ (1.72)	[1]	$ (1.50)	$ (0.79)
[1]	USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.

FAIR VALUE OF FINANCIAL INSTR_3

FAIR VALUE OF FINANCIAL INSTRUMENTS (Valuation of Securities Using Fair Value Hierarchy) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
United States Commodity Index Fund [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$ 436,426,995	$ 441,986,578
United States Commodity Index Fund [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(1,866,820)	1,609,317
United States Commodity Index Fund [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(12,621,164)	5,263,653
United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	436,426,995	441,986,578
United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(1,866,820)	1,609,317
United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(12,621,164)	5,263,653
United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
United States Commodity Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
United States Copper Index Fund [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	9,657,426	9,590,067
United States Copper Index Fund [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(903,475)	881,938
United States Copper Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	9,657,426	9,590,067
United States Copper Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(903,475)	881,938
United States Copper Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
United States Copper Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
United States Copper Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
United States Copper Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$ 0	0
United States Agriculture Index Fund [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		1,643,759
United States Agriculture Index Fund [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		(1,314)
United States Agriculture Index Fund [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		189
United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		1,643,759
United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		(1,314)
United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 1 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		189
United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		0
United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		0
United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 2 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		0
United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		0
United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | Foreign [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		0
United States Agriculture Index Fund [Member] | Fair Value, Inputs, Level 3 [Member] | Exchange-Traded Futures Contracts [Member] | United States [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value		$ 0

FAIR VALUE OF FINANCIAL INSTR_4

FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value of Derivative Instrument held by Usci, Cper, Usag and Usmi) (Details) - Commodity Contracts [Member] - Futures [Member] - Assets [Member] - USD ($)	Dec. 31, 2018	Dec. 31, 2017
United States Commodity Index Fund [Member]
Derivatives, Fair Value [Line Items]
Derivatives not Accounted for as Hedging Instruments	$ (14,487,984)	$ 6,872,970
United States Copper Index Fund [Member]
Derivatives, Fair Value [Line Items]
Derivatives not Accounted for as Hedging Instruments	(903,475)	881,938
United States Agriculture Index Fund [Member]
Derivatives, Fair Value [Line Items]
Derivatives not Accounted for as Hedging Instruments	$ 0	$ (1,125)

FAIR VALUE OF FINANCIAL INSTR_5

FAIR VALUE OF FINANCIAL INSTRUMENTS (Effect of Derivative Instruments on Statements of Operations of Usci, Cper, Usag and Usmi) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
United States Commodity Index Fund [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	$ (54,710,680)		$ 22,989,718	$ (22,063,913)
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	(21,360,954)		4,817,510	10,637,687
United States Commodity Index Fund [Member] | Commodity Contracts [Member] | Futures [Member] | Realized gain (loss) on closed positions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(54,710,680)		22,989,718	(22,063,913)
United States Commodity Index Fund [Member] | Commodity Contracts [Member] | Futures [Member] | Change in unrealized gain (loss) on open positions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	(21,360,954)		4,817,510	10,637,687
United States Copper Index Fund [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(1,318,188)		1,468,825	(19,600)
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	(1,785,413)		793,363	269,200
United States Copper Index Fund [Member] | Commodity Contracts [Member] | Futures [Member] | Realized gain (loss) on closed positions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(1,318,188)		1,468,825	(19,600)
United States Copper Index Fund [Member] | Commodity Contracts [Member] | Futures [Member] | Change in unrealized gain (loss) on open positions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	(1,785,413)		793,363	269,200
United States Agriculture Index Fund [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(181,039)	[1]	(238,006)	26,386
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	1,125	[1]	88,575	(95,856)
United States Agriculture Index Fund [Member] | Commodity Contracts [Member] | Futures [Member] | Realized gain (loss) on closed positions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	(181,039)		(238,006)	26,386
United States Agriculture Index Fund [Member] | Commodity Contracts [Member] | Futures [Member] | Change in unrealized gain (loss) on open positions [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	$ 1,125		$ 88,575	$ (95,857)
[1]	USAG ceased trading on the NYSE Arca on September 7, 2018 and the Fund's liquidation date was September 12, 2018.