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Combined Statements of Assets and Liabilities (Parenthetical) - USD ($)
Mar. 31, 2020
Jun. 30, 2019
SIT RISING RATE ETF    
Securities, at fair value $ 4,886,901 $ 11,928,143
Options written, premiums received 8,827 16,128
BREAKWAVE DRY BULK SHIPPING ETF    
Securities, at fair value 2,556,475 1,095,625
Options written, premiums received $ 0 $ 0