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Statements of Changes in Shareholders' Capital (Parenthetical) - shares	1 Months Ended	3 Months Ended	9 Months Ended
	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2016
SIT RISING RATE ETF [Member]
Stock Issued During Period, Shares, New Issues	50,000	100,000	600,000
ETF MANAGERS GROUP COMMODITY TRUST I [Member]
Stock Issued During Period, Shares, New Issues	50,000	100,000	600,000

X

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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: