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Net Asset Value and Financial Highlights | 6 Months Ended
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Dec. 31, 2019
Net Asset Value And Financial Highlights [Abstract] |
Net Asset Value and Financial Highlights | (10) Net Asset Value and Financial Highlights The Funds are presenting, as applicable, the following net asset value and financial highlights related to investment performance for a Share outstanding throughout the three months ended December 31, 2019 and December 31, 2018, respectively, and the six months ended December 31, 2019 and 2018, respectively. The net investment income and total expense ratios are calculated using average net assets. The net asset value presentation is calculated by dividing each 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.
|  | THREE MONTHS ENDED |  |  | THREE MONTHS ENDED |
|  | DECEMBER 31, 2019 |  |  | DECEMBER 31, 2018 |
|  | SIT RISING |  |  | BREAKWAVE DRY BULK SHIPPING |  |  | SIT RISING |  |  | BREAKWAVE DRY BULK SHIPPING |
|  | RATE ETF |  |  | ETF |  |  | RATE ETF |  |  | ETF |
Net Asset Value |  |  |  |  |  |  |  |  |  |  |  |
Net asset value per Share, beginning of period |  | $ | 22.61 |  |  | $ | 19.65 |  |  | $ | 25.13 |  |  | $ | 22.68 |
Net investment income (loss) |  |  | 0.05 |  |  |  | (0.17 | ) |  |  | 0.07 |  |  |  | (0.12 | )
Net realized and unrealized gain (loss) |  |  | 0.30 |  |  |  | (4.11 | ) |  |  | (1.14 | ) |  |  | (4.00 | )
Net Income (Loss) |  |  | 0.35 |  |  |  | (4.28 | ) |  |  | (1.07 | ) |  |  | (4.12 | )
Net Asset Value per Share, end of period |  | $ | 22.96 |  |  | $ | 15.37 |  |  | $ | 24.06 |  |  | $ | 18.56 |
Market Value per Share, end of period |  | $ | 22.97 |  |  | $ | 15.45 |  |  | $ | 24.09 |  |  | $ | 17.92 | (a)
Ratios to Average Net Assets* |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expense Ratio*** |  |  | 1.06 | % |  |  | 5.09 | % |  |  | 1.11 | % |  |  | 4.35 | %
Expense Ratio*** before Waiver/Assumption |  |  | 7.47 | % |  |  | 31.35 | % |  |  | 1.22 | % |  |  | 23.98 | %
Net Investment Income (Loss) |  |  | 0.93 | % |  |  | (3.69 | %) |  |  | 1.08 | % |  |  | (2.49 | %)
Total Return, at Net Asset Value** |  |  | 1.55 | % |  |  | (21.78 | %) |  |  | (4.26 | %) |  |  | (18.17 | %)
Total Return, at Market Value** |  |  | 1.50 | % |  |  | (21.61 | %) |  |  | (4.10 | %) |  |  | (21.88 | %)
| (a) | Represents the closing bid/ask mean as of December 31, 2018
| * | Percentages are annualized
| ** | Percentages are not annualized
| *** | For Sit Rising Rate ETF, effective January 1, 2018, Fund expenses have been capped at 1.00% of average daily net assets, plus brokerage commissions and interest expense. For Breakwave Dry Bulk Shipping ETF, as of inception (March 22, 2018), Fund expenses have been capped at 3.50% of average daily net assets, plus brokerage commissions and interest expense.
|  | SIX MONTHS ENDED |  |  | SIX MONTHS ENDED |
|  | DECEMBER 31, 2019 |  |  | DECEMBER 31, 2018 |
|  | SIT RISING |  |  | BREAKWAVE DRY BULK SHIPPING |  |  | SIT RISING |  |  | BREAKWAVE DRY BULK SHIPPING |
|  | RATE ETF |  |  | ETF |  |  | RATE ETF |  |  | ETF |
Net Asset Value |  |  |  |  |  |  |  |  |  |  |  |
Net asset value per Share, beginning of period |  | $ | 22.70 |  |  | $ | 13.25 |  |  | $ | 24.65 |  |  | $ | 21.98 |
Net investment income (loss) |  |  | 0.12 |  |  |  | (0.28 | ) |  |  | 0.12 |  |  |  | (0.30 | )
Net realized and unrealized gain (loss) |  |  | 0.14 |  |  |  | 2.40 |  |  |  | (0.71 | ) |  |  | (3.12 | )
Net Income (Loss) |  |  | 0.26 |  |  |  | 2.12 |  |  |  | (0.59 | ) |  |  | (3.42 | )
Net Asset Value per Share, end of period |  | $ | 22.96 |  |  | $ | 15.37 |  |  | $ | 24.06 |  |  |  | 18.56 |
Market Value per Share, end of period |  | $ | 22.97 |  |  | $ | 15.45 |  |  | $ | 24.09 |  |  |  | 17.92 | (a)
Ratios to Average Net Assets* |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expense Ratio*** |  |  | 1.08 | % |  |  | 4.89 | % |  |  | 1.19 | % |  |  | 4.43 | %
Expense Ratio*** before Waiver/Assumption |  |  | 6.59 | % |  |  | 25.77 | % |  |  | 1.36 | % |  |  | 21.70 | %
Net Investment Income (Loss) |  |  | 1.02 | % |  |  | (3.19 | %) |  |  | 1.02 | % |  |  | (2.79 | %)
Total Return, at Net Asset Value** |  |  | 1.15 | % |  |  | 16.00 | % |  |  | (2.39 | %) |  |  | (15.56 | %)
Total Return, at Market Value** |  |  | 1.06 | % |  |  | 17.49 | % |  |  | (2.31 | %) |  |  | (18.69 | %)
| (a) | Represents the closing bid/ask mean as of December 31, 2018
| * | Percentages are annualized
| ** | Percentages are not annualized
| *** | For Sit Rising Rate ETF, effective January 1, 2018, Fund expenses have been capped at 1.00% of average daily net assets, plus brokerage commissions and interest expense. For Breakwave Dry Bulk Shipping ETF, as of inception (March 22, 2018), Fund expenses have been capped at 3.50% of average daily net assets, plus brokerage commissions and interest expense.

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