Combined Statements of Changes in Net Assets (Unaudited) (Parenthetical) - shares	3 Months Ended	9 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
BREAKWAVE DRY BULK SHIPPING ETF
Addition during the period	1,250,000	2,775,000	1,525,000	2,850,000
Redemption during the period	1,725,000	50,000	4,575,000	300,000
SIT RISING RATE ETF
Addition during the period		0	0	0
Redemption during the period		0	250,040	275,000
ETF MANAGERS GROUP COMMODITY TRUST I
Addition during the period	0
Redemption during the period	0

Number of new stock issued during the period.

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-Name Accounting Standards Codification
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-Section S99
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Balance Type:	na
Period Type:	duration