Combined Statements of Assets and Liabilities (Unaudited) (Parenthetical) - USD ($)	Sep. 30, 2018	Jun. 30, 2018
SIT RISING RATE ETF [Member]
Investment in short-term securities, fair value	$ 60,742,455	$ 51,268,060
Options written, premiums received	67,595	48,680
BREAKWAVE DRY BULK SHIPPING ETF [Member]
Investment in short-term securities, fair value	1,219,673	1,249,009
Options written, premiums received	$ 0	$ 0

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Name:	us-gaap_Investments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant