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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.