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Schedule of Investments (Unaudited) (Parenthetical) - SIT RISING RATE ETF [Member]
3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
$ / Warrant
Jun. 30, 2017
USD ($)
$ / Warrant
Investment Owned, Percent of Net Assets 100.00% 100.00%
Purchased Options [Member] | U.S. Treasury 10 Year Note [Member]    
Investment Owned, Subject to Option, Price | $ / Warrant 127.00 127.00
Investment Owned, Subject to Option, Exercise Dates 10/27/2017 7/21/2017
Investment Owned, at Cost $ 53,125 $ 38,188
Investment Owned, Percent of Net Assets 0.30% 0.30%
Short-term Investments [Member]    
Investment Owned, Percent of Net Assets 95.80% 95.80%
Short-term Investments [Member] | US Treasury Securities [Member]    
Investment Owned, Subject to Option, Exercise Dates 10/26/2017 9/21/2017
Investment Owned, at Cost $ 25,483,102 $ 19,954,693
Investment Owned, Percent of Net Assets 95.80% 95.80%
Money Market Funds [Member]    
Investment Owned, at Cost $ 415,048 $ 290,291
Investment Owned, Percent of Net Assets 1.60% 1.40%
Money Market Funds [Member] | First American US Treasury Money Market Fund [Member]    
Investment Owned, Percent of Net Assets 0.85% [1] 70.00% [2]
Investments [Member]    
Investment Owned, at Cost $ 25,951,275 $ 20,283,172
Investment Owned, Percent of Net Assets 97.70% 97.50%
Assets in Excess of Other Liabilities [Member]    
Investment Owned Percent Of Other Liabilities 2.30% [3] 2.50% [4]
Written Options Contracts [Member] | U.S. Treasury 5 Year Note [Member]    
Investment Owned, Subject to Option, Price | $ / Warrant 118.00 118.75
Investment Owned, Subject to Option, Exercise Dates 10/27/2017 7/21/2017
Investment Owned Premiums Received $ 24,407 $ 16,688
Short Futures Contracts [Member] | U.S. Treasury 5 Year Note [Member]    
Investment Owned, Face Amount 27,377,500 18,500,242
Short Futures Contracts [Member] | U.S. Treasury 2 Year Note [Member]    
Investment Owned, Face Amount $ 51,983,700 $ 45,815,188
[1] Annualized seven-day yield as of September 30, 2017
[2] Annualized seven-day yield as of June 30, 2017
[3] $399,143 of cash is pledged as collateral for futures contracts and written options
[4] $521,215 of cash is pledged as collateral for futures contracts and written options