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Statements of Changes in Net Assets (Unaudited) (Parenthetical) - shares
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
SIT RISING RATE ETF [Member]    
Addition during the period 300,000 0
Redemption during the period 50,000 300,000
ETF MANAGERS GROUP COMMODITY TRUST I [Member]    
Addition during the period 300,000 0
Redemption during the period 50,000 300,000