Combined Statements of Changes in Net Assets (Unaudited) (Parenthetical) - shares	3 Months Ended			9 Months Ended
	Mar. 31, 2018		Mar. 31, 2017	Mar. 31, 2018		Mar. 31, 2017
SIT RISING RATE ETF [Member]
Addition during the period	250,000		350,000	1,000,000		400,000
Redemption during the period	0		0	250,000		350,000
BREAKWAVE DRY BULK SHIPPING ETF [Member]
Addition during the period	200,000	[1]		200,000	[1]
Redemption during the period	50,000	[1]		50,000	[1]

[1] Period from March 22, 2018 (commencement of investment operations) to March 31, 2018.