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Statements of Financial Condition (Parenthetical) - USD ($)	Mar. 31, 2016	Jun. 30, 2015
SIT RISING RATE ETF [Member]
Investments	$ 19,003,386	$ 5,682,577
Open Option Contracts Written, Premiums	76,048	21,797
ETF MANAGERS GROUP COMMODITY TRUST I [Member]
Investments	19,003,386	5,682,577
Open Option Contracts Written, Premiums	$ 76,048	$ 21,797

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(h))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the premiums earned on the open option contracts held by the fund. This item is not required to be disclosed in Regulation S-X but is commonly reported by some funds.

+ References

No definition available.

+ Details

Name:	us-gaap_OpenOptionContractsWrittenPremiums
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=cik000161094_SitRisingRateEtfMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=cik000161094_EtfManagersGroupCommodityTrustIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: