Organization (Details)	6 Months Ended
	Dec. 31, 2019	Jan. 01, 2018
Sit Fixed Income Advisors II, LLC [Member]
Organization (Textual)
Percentage of fee paid		0.20%
SIT RISING RATE ETF [Member]
Organization (Textual)
Percentage of fee paid		1.00%
Description of rise benchmark portfolio	If interest rates rise by 1%, the market value of a security with an effective duration of 5 years would decrease by 5%, with all other factors being constant, and likewise the market value of a security with an effective duration of negative 5 years would increase by 5%, with all other factors being constant. The correlation between duration and price sensitivity is greater for securities rated investment-grade than it is for securities rated below investment-grade.
SIT RISING RATE ETF [Member] | Minimum [Member]
Organization (Textual)
Percentage of funds asset	5.00%
Percentage of treasury instrument	3.00%
SIT RISING RATE ETF [Member] | Maximum [Member]
Organization (Textual)
Percentage of funds asset	15.00%
Percentage of treasury instrument	10.00%
SIT RISING RATE ETF [Member] | Two Year Maturity Treasury Instruments [Member] | Minimum [Member]
Organization (Textual)
Expected range for duration weighted percentage	30.00%
SIT RISING RATE ETF [Member] | Five Year Maturity Treasury Instruments [Member] | Maximum [Member]
Organization (Textual)
Expected range for duration weighted percentage	70.00%
SIT RISING RATE ETF [Member] | Ten Year Maturity Treasury Instruments [Member] | Minimum [Member]
Organization (Textual)
Expected range for duration weighted percentage	5.00%
SIT RISING RATE ETF [Member] | Ten Year Maturity Treasury Instruments [Member] | Maximum [Member]
Organization (Textual)
Expected range for duration weighted percentage	25.00%
BREAKWAVE DRY BULK SHIPPING ETF | Capesize Freight Futures contracts [Member]
Organization (Textual)
Percentage of concentration risk	50.00%
BREAKWAVE DRY BULK SHIPPING ETF | Panamax Freight Futures contracts [Member]
Organization (Textual)
Percentage of concentration risk	40.00%
BREAKWAVE DRY BULK SHIPPING ETF | Supramax Freight Futures contracts [Member]
Organization (Textual)
Percentage of concentration risk	10.00%
BREAKWAVE DRY BULK SHIPPING ETF | Minimum [Member]
Organization (Textual)
Percentage of freight futures position	10.00%
BREAKWAVE DRY BULK SHIPPING ETF | Maximum [Member]
Organization (Textual)
Percentage of freight futures position	40.00%