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Combined Statements of Changes in Net Assets (Unaudited) (Parenthetical) - shares
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
SIT RISING RATE ETF        
Addition during the period 0 0 0 975,000
Redemption during the period 0 1,275,000 275,000 1,850,000
BREAKWAVE DRY BULK SHIPPING ETF        
Addition during the period 2,775,000 175,000 2,850,000 175,000
Redemption during the period 50,000 0 300,000 0