Investments (Details 1) - USD ($)

3 Months Ended

9 Months Ended

Mar. 31, 2018

Mar. 31, 2017

Mar. 31, 2018

Mar. 31, 2017

Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]

Realized Gain (Loss) on Derivatives Recognized in Income

$ 1,668,846

$ 147,281

$ 2,183,870

$ 521,605

Change in Unrealized gain (loss) on Derivatives Recognized in Income

(1,004,995)

(357,457)

(720,335)

(3,057)

SIT RISING RATE ETF [Member]

Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]

Realized Gain (Loss) on Derivatives Recognized in Income

1,668,846

147,281

2,183,870

521,605

Change in Unrealized gain (loss) on Derivatives Recognized in Income

$ (652,845)

$ (357,457)

$ (368,185)

$ (3,057)

SIT RISING RATE ETF [Member] | Interest Rate Risk [Member]

Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]

Location of Gain (Loss) on Derivatives

Net realized gain on investments, futures and options contracts and/or Change in unrealized gain (loss) on investments, futures and options contracts

Net realized gain (loss) on investments, futures and options contracts and/or Change in unrealized gain (loss) on investments, futures and options contracts

Net realized gain on investments, futures and options contracts and/or Change in unrealized gain (loss) on investments, futures and options contracts

Net realized gain (loss) on investments, futures and options contracts and/or Change in unrealized gain (loss) on investments, futures and options contracts

Realized Gain (Loss) on Derivatives Recognized in Income

$ 1,668,846

$ 147,281

$ 2,183,870

$ 521,605

Change in Unrealized gain (loss) on Derivatives Recognized in Income

(660,568)

(357,457)

(368,185)

(3,057)

BREAKWAVE DRY BULK SHIPPING ETF [Member]

Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]

Realized Gain (Loss) on Derivatives Recognized in Income

Change in Unrealized gain (loss) on Derivatives Recognized in Income

$ (352,150)

$ (352,150)

BREAKWAVE DRY BULK SHIPPING ETF [Member] | Interest Rate Risk [Member]

Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]

Location of Gain (Loss) on Derivatives

Net realized gain on investments and futures and/or Change in unrealized gain (loss) on investments and futures contracts

Realized Gain (Loss) on Derivatives Recognized in Income

Change in Unrealized gain (loss) on Derivatives Recognized in Income

^[1]

$ (352,150)

[1] Represents cumulative depreciation of futures contracts as reported in the Combined Statements of Assets and Liabilities