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Statements of Cash Flows - USD ($)
 1 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2016
SIT RISING RATE ETF [Member]    
Cash flows provided by (used in) operating activities    
Net income (loss) $ (178,267) [1] $ (995,857)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Net realized loss (gain) on investments   726,684
Change in net unrealized loss (gain) on investments   127,903
Purchase of investments (5,688,644) [1] (14,114,582)
Increase in interest receivable   (286)
Increase in segregated cash held by broker (549,697) [1] (320,438)
Increase in options written, at fair value 60,586 [1] 163,047
Increase in receivable on open futures contracts   $ (38,845)
Increase in payable on open futures contracts [1] $ 102,703  
Decrease in options written, at fair value [1]
Decrease in payable on open futures contracts   $ (2,579)
Increase in due to Sponsor $ 7,654 [1] 17,683
Net cash provided by (used in) operating activities (6,245,665) [1] (14,437,270)
Cash flows from finanacing activities    
Proceeds from sale of shares 1,245,665 [1] 14,437,270
Net cash provided by financing activities 1,245,665 [1] 14,437,270
Net increase (decrease) in cash (5,000,000) [1] 0
Cash, beginning of period 5,001,000 [1] 0
Cash, end of period 1,000 [1] 0
ETF MANAGERS GROUP COMMODITY TRUST I [Member]    
Cash flows provided by (used in) operating activities    
Net income (loss) (178,267) [1] (995,857)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Net realized loss (gain) on investments   726,684
Change in net unrealized loss (gain) on investments   127,903
Purchase of investments (5,688,644) [1] (14,114,582)
Increase in interest receivable   (286)
Increase in segregated cash held by broker (549,697) [1] (320,438)
Increase in options written, at fair value 60,586 [1] 163,047
Increase in receivable on open futures contracts   $ (38,845)
Increase in payable on open futures contracts [1] $ 102,703  
Decrease in options written, at fair value [1]
Decrease in payable on open futures contracts   $ (2,579)
Increase in due to Sponsor $ 7,654 [1] 17,683
Net cash provided by (used in) operating activities (6,245,665) [1] (14,437,270)
Cash flows from finanacing activities    
Proceeds from sale of shares 1,245,665 [1] 14,437,270
Net cash provided by financing activities 1,245,665 [1] 14,437,270
Net increase (decrease) in cash (5,000,000) [1] 0
Cash, beginning of period 5,001,000 [1] 0
Cash, end of period $ 1,000 [1] $ 0
[1] Commencement of investment operations.