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Creations and Redemptions (Details) - SIT RISING RATE ETF [Member] - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2016
Shares Sold, Shares | 50,000 |  | 100,000 | 600,000
Shares Redeemed, Shares | 0 |  | 0 | 0
Net Increase (Decrease), Shares | 50,000 |  | 100,000 | 600,000
Addition of shares, respectively | $ (1,245,665) | [1] | $ (2,384,370) | $ (14,437,270)
Shares Redeemed, Paid in Capital | 0 |  | 0 | 0
Net Increase (Decrease), Paid in Capital | $ 1,245,665 | [1] | $ 2,384,370 | $ 14,437,270
[1] | Commencement of investment operations.

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