v3.22.2.2
Statements of Cash Flows - USD ($)
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
BREAKWAVE DRY BULK SHIPPING ETF    
Cash flows provided by/used in operating activities    
Net income (loss) $ (33,398,736)  
Adjustments to reconcile net income (loss) to net cash    
Net realized (gain) loss on investments (836,968)  
Change in net unrealized (gain) loss on investments 30,988,515  
Change in operating assets and liabilities:    
Sale (Purchase) of investments - net (4,706,252)  
Increase (decrease) in interest receivable (16,798)  
Decrease (increase) in receivable on open futures contracts 20,038,735  
Increase (decrease) in payable on open futures contracts 9,265,175  
Decrease (increase) in prepaid expenses 24,071  
Increase (decrease) in due to Sponsor 36,675  
Decrease (increase) in other accrued expenses (55,280)  
Net cash provided by operating activities 21,339,137  
Cash flows from financing activities    
Proceeds from sale of shares 125,116,790  
Paid on redemption of shares (159,308,038)  
Net cash provided by/used in financing activities (34,191,248)  
Net increase (decrease) in cash and restricted cash (12,852,111)  
Cash and restricted cash, beginning of year 50,040,588  
Cash and restricted cash, end of year 37,188,477 $ 50,040,588
Cash  
Segregated cash held by broker 37,188,477  
Total cash and restricted cash as shown on the statement of cash flows. 37,188,477  
ETF MANAGERS GROUP COMMODITY TRUST I    
Cash flows provided by/used in operating activities    
Net income (loss) (33,398,736)  
Adjustments to reconcile net income (loss) to net cash    
Net realized (gain) loss on investments (836,968)  
Change in net unrealized (gain) loss on investments 30,988,515  
Change in operating assets and liabilities:    
Sale (Purchase) of investments - net (4,706,252)  
Increase (decrease) in interest receivable (16,798)  
Decrease (increase) in receivable on open futures contracts 20,038,735  
Increase (decrease) in payable on open futures contracts 9,265,175  
Decrease (increase) in prepaid expenses 24,071  
Increase (decrease) in due to Sponsor (6,263)  
Decrease (increase) in other accrued expenses (12,342)  
Net cash provided by operating activities 21,339,137  
Cash flows from financing activities    
Proceeds from sale of shares 125,116,790  
Paid on redemption of shares (159,308,038)  
Net cash provided by/used in financing activities (34,191,248)  
Net increase (decrease) in cash and restricted cash (12,852,111)  
Cash and restricted cash, beginning of year 50,040,588  
Cash and restricted cash, end of year 37,188,477 50,040,588
Cash  
Segregated cash held by broker 37,188,477  
Total cash and restricted cash as shown on the statement of cash flows. 37,188,477  
BREAKWAVE DRY BULK SHIPPING ETF    
Cash flows provided by/used in operating activities    
Net income (loss) (33,398,736) 59,411,309
Adjustments to reconcile net income (loss) to net cash    
Net realized (gain) loss on investments   (48,115,213)
Change in net unrealized (gain) loss on investments   (13,142,015)
Change in operating assets and liabilities:    
Sale (Purchase) of investments - net   26,590,032
Increase (decrease) in interest receivable   102
Decrease (increase) in receivable on open futures contracts   (13,142,015)
Increase (decrease) in payable on open futures contracts  
Decrease (increase) in prepaid expenses   (24,071)
Decrease in payable for Fund shares redeemed   (192,533)
Decrease in options written, at fair value  
Increase (decrease) in due to Sponsor   150,791
Decrease (increase) in other accrued expenses   93,454
Net cash provided by operating activities   11,629,841
Cash flows from financing activities    
Proceeds from sale of shares   95,774,278
Paid on redemption of shares   (85,383,922)
Net cash provided by/used in financing activities   10,390,356
Net increase (decrease) in cash and restricted cash   22,020,197
Cash and restricted cash, beginning of year 50,040,588 28,020,391 [1]
Cash and restricted cash, end of year   50,040,588
Cash  
Segregated cash held by broker   50,040,588
Total cash and restricted cash as shown on the statement of cash flows.   50,040,588
SIT RISING RATE ETF    
Cash flows provided by/used in operating activities    
Net income (loss) [1]   (69,948)
Adjustments to reconcile net income (loss) to net cash    
Net realized (gain) loss on investments [1]   29,138
Change in net unrealized (gain) loss on investments [1]   (10,459)
Change in operating assets and liabilities:    
Sale (Purchase) of investments - net [1]   4,861,090
Increase (decrease) in interest receivable  
Decrease (increase) in receivable on open futures contracts  
Increase (decrease) in payable on open futures contracts [1]   (5,144)
Decrease (increase) in prepaid expenses  
Decrease in payable for Fund shares redeemed  
Decrease in options written, at fair value [1]   (4,148)
Increase (decrease) in due to Sponsor [1]   (4,179)
Decrease (increase) in other accrued expenses  
Net cash provided by operating activities [1]   4,796,350
Cash flows from financing activities    
Proceeds from sale of shares  
Paid on redemption of shares [1]   (4,998,233)
Net cash provided by/used in financing activities [1]   (4,998,233)
Net increase (decrease) in cash and restricted cash [1]   (201,883)
Cash and restricted cash, beginning of year 201,883 [1]
Cash and restricted cash, end of year  
Cash  
Segregated cash held by broker  
Total cash and restricted cash as shown on the statement of cash flows.  
COMBINED    
Cash flows provided by/used in operating activities    
Net income (loss)   59,341,361
Adjustments to reconcile net income (loss) to net cash    
Net realized (gain) loss on investments   (48,086,075)
Change in net unrealized (gain) loss on investments   (13,152,474)
Change in operating assets and liabilities:    
Sale (Purchase) of investments - net   31,451,122
Increase (decrease) in interest receivable   102
Decrease (increase) in receivable on open futures contracts   (13,142,015)
Increase (decrease) in payable on open futures contracts   (5,144)
Decrease (increase) in prepaid expenses   (24,071)
Decrease in payable for Fund shares redeemed   (192,533)
Decrease in options written, at fair value   (4,148)
Increase (decrease) in due to Sponsor   146,612
Decrease (increase) in other accrued expenses   93,454
Net cash provided by operating activities   16,426,191
Cash flows from financing activities    
Proceeds from sale of shares   95,774,278
Paid on redemption of shares   (90,382,155)
Net cash provided by/used in financing activities   5,392,123
Net increase (decrease) in cash and restricted cash   21,818,314
Cash and restricted cash, beginning of year $ 50,040,588 28,222,274
Cash and restricted cash, end of year   50,040,588
Cash  
Segregated cash held by broker   50,040,588
Total cash and restricted cash as shown on the statement of cash flows.   $ 50,040,588
[1] Period from July 1, 2020 to October 30, 2020 - Sit Rising Rate ETF liquidated as of November 18, 2020.