CONTRACTS AND AGREEMENTS (Brokerage Commission) (Details) - USD ($)
|
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Long Duration Contracts Assumptions By Product and Guarantee [Line Items] |
|
|
|
| Brokerage commissions |
$ 780,427
|
$ 715,863
|
$ 658,367
|
| United States Commodity Index Fund [Member] |
|
|
|
| Long Duration Contracts Assumptions By Product and Guarantee [Line Items] |
|
|
|
| Brokerage commissions |
$ 776,649
|
$ 711,491
|
$ 653,625
|
| Brokerage commissions as a percentage of average daily net assets |
0.13%
|
0.13%
|
0.09%
|
| United States Commodity Index Fund [Member] | Rebalancing Investments Transaction [Member] |
|
|
|
| Long Duration Contracts Assumptions By Product and Guarantee [Line Items] |
|
|
|
| Brokerage commissions |
$ 752,519
|
$ 675,051
|
$ 614,322
|
| Brokerage commissions as a percentage of average daily net assets |
96.89%
|
94.88%
|
93.99%
|
| United States Commodity Index Fund [Member] | Creation and Redemption Activity [Member] |
|
|
|
| Long Duration Contracts Assumptions By Product and Guarantee [Line Items] |
|
|
|
| Brokerage commissions |
$ 24,130
|
$ 36,440
|
$ 39,303
|
| Brokerage commissions as a percentage of average daily net assets |
3.11%
|
5.12%
|
6.01%
|
| United States Copper Index Fund [Member] |
|
|
|
| Long Duration Contracts Assumptions By Product and Guarantee [Line Items] |
|
|
|
| Brokerage commissions |
$ 1,628
|
$ 947
|
$ 1,896
|
| Brokerage commissions as a percentage of average daily net assets |
0.06%
|
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 |
$ 1,455
|
$ 588
|
$ 1,382
|
| Brokerage commissions as a percentage of average daily net assets |
89.37%
|
62.09%
|
72.89%
|
| United States Copper Index Fund [Member] | Creation and Redemption Activity [Member] |
|
|
|
| Long Duration Contracts Assumptions By Product and Guarantee [Line Items] |
|
|
|
| Brokerage commissions |
$ 173
|
$ 359
|
$ 514
|
| Brokerage commissions as a percentage of average daily net assets |
10.63%
|
37.91%
|
27.11%
|
| United States Agriculture Index Fund [Member] |
|
|
|
| Long Duration Contracts Assumptions By Product and Guarantee [Line Items] |
|
|
|
| Brokerage commissions |
$ 2,150
|
$ 3,116
|
$ 2,020
|
| Brokerage commissions as a percentage of average daily net assets |
0.11%
|
0.15%
|
0.08%
|
| United States Agriculture Index Fund [Member] | Rebalancing Investments Transaction [Member] |
|
|
|
| Long Duration Contracts Assumptions By Product and Guarantee [Line Items] |
|
|
|
| Brokerage commissions |
$ 2,150
|
$ 3,116
|
$ 2,020
|
| 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%
|