Combined Schedules of Investments (Unaudited) (Parenthetical)		9 Months Ended	12 Months Ended
		Mar. 31, 2018 USD ($) $ / Warrant	Jun. 30, 2017 USD ($) $ / Warrant
Investment Owned, Percent of Net Assets		100.00%	100.00%
Money Market Funds [Member]
Investment Owned, at Cost			$ 290,291
Investment Owned, Percent of Net Assets			1.40%
Money Market Funds [Member] | BREAKWAVE DRY BULK SHIPPING ETF [Member]
Investment Owned, at Cost		$ 2,252,315
Money Market Funds [Member] | SIT RISING RATE ETF [Member]
Investment Owned, at Cost		$ 1,381,124
Money Market Funds [Member] | SIT RISING RATE ETF [Member] | Minimum [Member]
Investment Owned, Percent of Net Assets		3.40%
Money Market Funds [Member] | SIT RISING RATE ETF [Member] | Maximum [Member]
Investment Owned, Percent of Net Assets		66.60%
Money Market Funds [Member] | First American US Treasury Money Market Fund [Member]
Investment Owned, Percent of Net Assets	[1]		70.00%
Money Market Funds [Member] | First American US Treasury Money Market Fund [Member] | BREAKWAVE DRY BULK SHIPPING ETF [Member]
Investment Owned, Percent of Net Assets	[2]	1.56%
Money Market Funds [Member] | First American US Treasury Money Market Fund [Member] | SIT RISING RATE ETF [Member]
Investment Owned, Percent of Net Assets	[2]	1.40%
Purchased Options [Member] | U.S. Treasury 10 Year Note [Member]
Investment Owned, Subject to Option, Price | $ / Warrant		120.50	127.00
Investment Owned, Subject to Option, Exercise Dates		04/20/2018	7/21/2017
Investment Owned, at Cost		$ 83,441	$ 38,188
Investment Owned, Percent of Net Assets			0.30%
Purchased Options [Member] | U.S. Treasury 10 Year Note [Member] | Minimum [Member]
Investment Owned, Percent of Net Assets		0.10%
Purchased Options [Member] | U.S. Treasury 10 Year Note [Member] | Maximum [Member]
Investment Owned, Percent of Net Assets		0.00%
Short-term Investments [Member]
Investment Owned, Percent of Net Assets			95.80%
Short-term Investments [Member] | Minimum [Member]
Investment Owned, Percent of Net Assets		95.60%
Short-term Investments [Member] | Maximum [Member]
Investment Owned, Percent of Net Assets		95.60%
Short-term Investments [Member] | US Treasury Securities [Member]
Investment Owned, Subject to Option, Exercise Dates		04/12/2018	9/21/2017
Investment Owned, at Cost		$ 38,480,873	$ 19,954,693
Investment Owned, Percent of Net Assets			95.80%
Short-term Investments [Member] | US Treasury Securities [Member] | Minimum [Member]
Investment Owned, Percent of Net Assets		95.60%
Short-term Investments [Member] | US Treasury Securities [Member] | Maximum [Member]
Investment Owned, Percent of Net Assets		0.00%
Investments [Member]
Investment Owned, at Cost		$ 39,945,438	$ 20,283,172
Investment Owned, Percent of Net Assets			97.50%
Investments [Member] | Minimum [Member]
Investment Owned, Percent of Net Assets		99.10%
Investments [Member] | Maximum [Member]
Investment Owned, Percent of Net Assets		66.60%
Assets in Excess of Other Liabilities [Member]
Investment Owned Percent Of Other Liabilities			2.50%
Assets in Excess of Other Liabilities [Member] | Minimum [Member]
Investment Owned Percent Of Other Liabilities		0.90%
Assets in Excess of Other Liabilities [Member] | Maximum [Member]
Investment Owned Percent Of Other Liabilities		33.40%
Written Options Contracts [Member] | U.S. Treasury 5 Year Note [Member] | SIT RISING RATE ETF [Member]
Investment Owned, Subject to Option, Price | $ / Warrant		114.25	118.75
Investment Owned, Subject to Option, Exercise Dates		04/20/2018	7/21/2017
Investment Owned Premiums Received		$ 44,529	$ 16,688
Short Futures Contracts [Member] | U.S. Treasury 5 Year Note [Member] | SIT RISING RATE ETF [Member]
Investment Owned, Face Amount		41,091,477	18,500,242
Short Futures Contracts [Member] | U.S. Treasury 2 Year Note [Member] | SIT RISING RATE ETF [Member]
Investment Owned, Face Amount		$ 75,476,328	$ 45,815,188

[1] Annualized seven-day yield as of June 30, 2017

[2] Annualized seven-day yield as of March 31, 2018