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Investments (Details) - USD ($)
Mar. 31, 2020
Jun. 30, 2019
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]    
Payable on open futures contracts $ 2,376,354 $ 326,457
Written options, at fair value (18,867) (19,336)
SIT RISING RATE ETF [Member]    
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]    
Payable on open futures contracts 400,059 326,457
Written options, at fair value (18,867) (19,336)
SIT RISING RATE ETF [Member] | Interest Rate Risk [Member]    
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]    
Purchased options [1] 16,000 35,625
Payable on open futures contracts [2] (400,059) (326,457)
Written options, at fair value [1] (18,867) (19,336)
BREAKWAVE DRY BULK SHIPPING ETF    
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]    
Payable on open futures contracts 1,976,295
Written options, at fair value
BREAKWAVE DRY BULK SHIPPING ETF | Interest Rate Risk [Member]    
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]    
Payable on open futures contracts [2] $ (1,976,295)  
Receivable on open futures contracts [3]   $ 391,415
[1] Represents fair value of options contracts as reported in the Combined Statements of Assets and Liabilities.
[2] Represents cumulative depreciation of futures contracts as reported in the Combined Statements of Assets and Liabilities.
[3] Represents cumulative appreciation of futures contracts as reported in the Combined Statements of Assets and Liabilities.