Investments (Details) - USD ($)		Dec. 31, 2019	Jun. 30, 2019
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Written options, at fair value		$ (5,906)	$ (19,336)
Payable on open futures contracts		105,125	326,457
SIT RISING RATE ETF [Member]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Written options, at fair value		(5,906)	(19,336)
Payable on open futures contracts			326,457
SIT RISING RATE ETF [Member] | Interest Rate Risk [Member]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Purchased options	[1]	21,797	35,625
Receivable on open futures contracts	[2]	15,878
Written options, at fair value	[1]	(5,906)	(19,336)
Payable on open futures contracts	[3]		(326,457)
BREAKWAVE DRY BULK SHIPPING ETF
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Written options, at fair value
Payable on open futures contracts		105,125
BREAKWAVE DRY BULK SHIPPING ETF | Interest Rate Risk [Member]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Receivable on open futures contracts	[2]		$ 391,415
Payable on open futures contracts	[3]	$ (105,125)

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

[2] Represents cumulative appreciation of futures 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.