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Net Asset Value and Financial Highlights | 9 Months Ended
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Mar. 31, 2016
Net Asset Value And Financial Highlights [Abstract] |
Net Asset Value And Financial Highlights Disclosure [Text Block] | (10) Net Asset Value and Financial Highlights The Fund is presenting the following net asset value and financial highlights related to investment performance for a Share outstanding throughout the Three Months Ended March 31, 2016, the Nine Months Ended March 31, 2016, and the Three Months Ended March 31, 2015, respectively. The net investment income and total expense ratios are calculated using average net assets. The net asset value presentation is calculated by dividing the Fund’s net assets by the average daily number of Shares outstanding. The net investment income (loss) and expense ratios have been annualized. The total return is based on the change in net asset value and market value of the Shares during the period. An individual investor’s return and ratios may vary based on the timing of their transactions in Fund Shares.
|  |  |  |  |  |  |  | For the Period |
|  | For the Three |  |  | For the Nine |  |  | from |
|  | Months Ended |  |  | Months Ended |  |  | February 19, 2015 to |
|  | March 31, |  |  | March 31, |  |  | March 31, |
|  | 2016 |  |  | 2016 |  |  | 2015 |
Net Asset Value |  |  |  |  |  |  |  |  |  |  |  |
Net asset value per Share, beginning of period |  | $ | 24.21 |  |  | $ | 24.24 |  |  | $ | 25.00 |
Net investment income (loss) |  |  | (0.08) |  |  |  | (0.28) |  |  |  | (0.05) |
Net realized and unrealized gain (loss) |  |  | (1.19) |  |  |  | (1.02) |  |  |  | (0.68) |
Net Income (Loss) |  |  | (1.27) |  |  |  | (1.30) |  |  |  | (0.73) |
Net Asset Value per Share, end of period |  | $ | 22.94 |  |  | $ | 22.94 |  |  | $ | 24.27 |
Market Value per Share, end of period |  | $ | 23.03 |  |  | $ | 23.03 |  |  | $ | 24.32 | (a)
Ratios to Average Net Assets* |  |  |  |  |  |  |  |  |  |  |  |
Expense Ratio*** |  |  | 1.68 | % |  |  | 1.71 | % |  |  | 1.71 | %
Expense Ratio*** before Waiver/Assumption |  |  | 3.15 | % |  |  | 4.41 | % |  |  | 10.56 | %
Net Investment Income (Loss) |  |  | (1.46) | % |  |  | (1.57) | % |  |  | (1.71) | %
Total Return, at Net Asset Value** |  |  | (5.25) | % |  |  | (5.36) | % |  |  | (2.92) | %
Total Return, at Market Value** |  |  | (4.95) | % |  |  | (5.73) | % |  |  | (2.72) | %
* Percentages are annualized. ** Percentages are not annualized. *** As of February 19, 2015 Fund expenses have been capped at 1.50% of average daily net assets, plus brokerage commissions and interest expense, as disclosed in Note 4.
(a) | Represents the closing bid/ask mean as of March 31, 2015.

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