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Statements of Financial Condition - USD ($)
Mar. 31, 2016
Jun. 30, 2015
SIT RISING RATE ETF [Member]    
Assets    
Investment in short-term securities, at fair value (cost $19,003,386, $5,682,577, $19,003,386 and $5,682,577, respectively) $ 18,938,447 $ 5,678,452
Interest receivable 286  
Segregated cash held by broker 731,483 411,045
Receivable on open futures contracts 48,032 9,187
Total assets 19,718,248 6,098,684
Liabilities and shareholders' capital    
Options written, at fair value (premiums received $76,048, $21,797, $76,048 and $21,797, respectively) 190,117 27,070
Payable on open futures contracts   2,579
Due to Sponsor 25,216 7,533
Total liabilities 215,333 37,182
Shareholders’ capital    
Paid in capital 20,683,935 6,246,665
Accumulated earnings (deficit) (1,181,020) (185,163)
Total shareholders' capital 19,502,915 6,061,502
Total liabilities and shareholders' capital $ 19,718,248 $ 6,098,684
Shares outstanding (unlimited authorized) 850,040 250,040
Net asset value per share $ 22.94 $ 24.24
Market value per share $ 23.03 $ 24.43
ETF MANAGERS GROUP COMMODITY TRUST I [Member]    
Assets    
Investment in short-term securities, at fair value (cost $19,003,386, $5,682,577, $19,003,386 and $5,682,577, respectively) $ 18,938,447 $ 5,678,452
Interest receivable 286  
Segregated cash held by broker 731,483 411,045
Receivable on open futures contracts 48,032 9,187
Total assets 19,718,248 6,098,684
Liabilities and shareholders' capital    
Options written, at fair value (premiums received $76,048, $21,797, $76,048 and $21,797, respectively) 190,117 27,070
Payable on open futures contracts   2,579
Due to Sponsor 25,216 7,533
Total liabilities 215,333 37,182
Shareholders’ capital    
Paid in capital 20,683,935 6,246,665
Accumulated earnings (deficit) (1,181,020) (185,163)
Total shareholders' capital 19,502,915 6,061,502
Total liabilities and shareholders' capital $ 19,718,248 $ 6,098,684