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Schedule of Investments (Parenthetical) - SIT RISING RATE ETF [Member]
6 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
$ / Warrant
Mar. 31, 2016
USD ($)
$ / Warrant
Purchased Options [Member]    
Investment Owned, Subject to Option, Price | $ / Warrant 126  
Purchased Options [Member] | CBT U.S. Treasury 10 Year Note [Member]    
Investment Owned, Subject to Option, Price | $ / Warrant 126  
Investment Owned, Subject to Option, Exercise Dates 7/24/2015 4/22/2016
Investment Owned, at Cost $ 20,625 $ 74,941
Investment Owned, Percent of Net Assets 0.30%  
Short-term Investments [Member]    
Investment Owned, at Cost $ 5,661,952 $ 18,928,445
Investment Owned, Percent of Net Assets 93.40% 97.10%
Short-term Investments [Member] | US Treasury Securities [Member]    
Investment Owned, Subject to Option, Exercise Dates   4/21/2016
Investment Owned, at Cost   $ 18,247,369
Investment Owned, Percent of Net Assets   93.60%
Short-term Investments [Member] | First American US Treasury Money Market Fund [Member]    
Investment Owned, Percent of Net Assets 0.00% 0.13%
Assets in Excess of Other Liabilities [Member]    
Investment Owned, Percent of Net Assets 100.00% 100.00%
Investment Owned Percent Of Other Liabilities 6.30% 2.90%
Written Options Contracts [Member] | CBT U.S. Treasury 5 Year Note [Member]    
Investment Owned, Subject to Option, Price | $ / Warrant 119 120
Investment Owned, Subject to Option, Exercise Dates 7/24/2015 4/22/2016
Investment Owned Premiums Received $ 21,797 $ 76,048
Short Futures Contracts [Member] | CBT U.S. Treasury 5 Year Note [Member]    
Investment Owned, Subject to Option, Exercise Dates September 2015 June 2016
Investment Owned, Face Amount $ 2,862,188 $ 9,329,633
Short Futures Contracts [Member] | CBT U.S. Treasury 2 Year Note [Member]    
Investment Owned, Subject to Option, Exercise Dates September 2015 June 2016
Investment Owned, Percent of Net Assets   0.00%
Investment Owned, Face Amount $ 13,793,063 $ 41,562,500
Investments [Member]    
Investment Owned, at Cost $ 5,682,577 $ 19,003,386
Investment Owned, Percent of Net Assets 93.70% 97.10%
Money Market Funds [Member]    
Investment Owned, at Cost   $ 681,076
Investment Owned, Percent of Net Assets   3.50%