Investments (Details) - USD ($)		Mar. 31, 2018		Jun. 30, 2017
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Written options, at fair value		$ (56,469)		$ (3,477)
Payable on open futures contracts		582,868
SIT RISING RATE ETF [Member]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Written options, at fair value		(56,469)		(3,477)
Payable on open futures contracts		230,718
SIT RISING RATE ETF [Member] | Interest Rate Risk [Member]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Receivable on open futures contracts				21,795	[1]
Written options, at fair value		56,469	[1]	(3,477)	[2]
Payable on open futures contracts	[3]	230,718
BREAKWAVE DRY BULK SHIPPING ETF [Member]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Written options, at fair value
Payable on open futures contracts		352,150
BREAKWAVE DRY BULK SHIPPING ETF [Member] | Interest Rate Risk [Member]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Payable on open futures contracts		$ (352,150)

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

[2] Represents fair value of options contracts as reported in the Combined Statements of Assets and Liabilities.

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