Net Asset Value and Financial Highlights (Tables)

6 Months Ended

Dec. 31, 2019

Net Asset Value And Financial Highlights [Abstract]

Schedule of net asset value and ratios to average net assets

	THREE MONTHS ENDED						THREE MONTHS ENDED
	DECEMBER 31, 2019						DECEMBER 31, 2018
	SIT RISING			BREAKWAVE DRY BULK SHIPPING			SIT RISING			BREAKWAVE DRY BULK SHIPPING
	RATE ETF			ETF			RATE ETF			ETF
Net Asset Value
Net asset value per Share, beginning of period	$	22.61		$	19.65		$	25.13		$	22.68
Net investment income (loss)		0.05			(0.17	)		0.07			(0.12	)
Net realized and unrealized gain (loss)		0.30			(4.11	)		(1.14	)		(4.00	)
Net Income (Loss)		0.35			(4.28	)		(1.07	)		(4.12	)
Net Asset Value per Share, end of period	$	22.96		$	15.37		$	24.06		$	18.56
Market Value per Share, end of period	$	22.97		$	15.45		$	24.09		$	17.92	(a)
Ratios to Average Net Assets*
Expense Ratio***		1.06	%		5.09	%		1.11	%		4.35	%
Expense Ratio*** before Waiver/Assumption		7.47	%		31.35	%		1.22	%		23.98	%
Net Investment Income (Loss)		0.93	%		(3.69	%)		1.08	%		(2.49	%)
Total Return, at Net Asset Value**		1.55	%		(21.78	%)		(4.26	%)		(18.17	%)
Total Return, at Market Value**		1.50	%		(21.61	%)		(4.10	%)		(21.88	%)

(a) Represents the closing bid/ask mean as of December 31, 2018

* Percentages are annualized

** Percentages are not annualized

*** For Sit Rising Rate ETF, effective January 1, 2018, Fund expenses have been capped at 1.00% of average daily net assets, plus brokerage commissions and interest expense. For Breakwave Dry Bulk Shipping ETF, as of inception (March 22, 2018), Fund expenses have been capped at 3.50% of average daily net assets, plus brokerage commissions and interest expense.

	SIX MONTHS ENDED						SIX MONTHS ENDED
	DECEMBER 31, 2019						DECEMBER 31, 2018
	SIT RISING			BREAKWAVE DRY BULK SHIPPING			SIT RISING			BREAKWAVE DRY BULK SHIPPING
	RATE ETF			ETF			RATE ETF			ETF
Net Asset Value
Net asset value per Share, beginning of period	$	22.70		$	13.25		$	24.65		$	21.98
Net investment income (loss)		0.12			(0.28	)		0.12			(0.30	)
Net realized and unrealized gain (loss)		0.14			2.40			(0.71	)		(3.12	)
Net Income (Loss)		0.26			2.12			(0.59	)		(3.42	)
Net Asset Value per Share, end of period	$	22.96		$	15.37		$	24.06			18.56
Market Value per Share, end of period	$	22.97		$	15.45		$	24.09			17.92	(a)
Ratios to Average Net Assets*
Expense Ratio***		1.08	%		4.89	%		1.19	%		4.43	%
Expense Ratio*** before Waiver/Assumption		6.59	%		25.77	%		1.36	%		21.70	%
Net Investment Income (Loss)		1.02	%		(3.19	%)		1.02	%		(2.79	%)
Total Return, at Net Asset Value**		1.15	%		16.00	%		(2.39	%)		(15.56	%)
Total Return, at Market Value**		1.06	%		17.49	%		(2.31	%)		(18.69	%)

(a) Represents the closing bid/ask mean as of December 31, 2018

* Percentages are annualized

** Percentages are not annualized

*** For Sit Rising Rate ETF, effective January 1, 2018, Fund expenses have been capped at 1.00% of average daily net assets, plus brokerage commissions and interest expense. For Breakwave Dry Bulk Shipping ETF, as of inception (March 22, 2018), Fund expenses have been capped at 3.50% of average daily net assets, plus brokerage commissions and interest expense.