Combined Schedules of Investments		3 Months Ended		6 Months Ended
		Jun. 30, 2019 USD ($) Number shares		Dec. 31, 2019 USD ($) Number shares
Investment owned, at Fair value		$ 16,228,411		$ 8,047,267
US Treasury Securities
Investment owned, at Fair value				5,344,368
Investment owned, Balance, Principal amount		11,591,734		5,344,368
Futures Contracts
Value investment owned, Appreciation/(Depreciation)		81,680		105,125
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Expiring January 31, 2020 [Member]
Value investment owned, Appreciation/(Depreciation)				(31,980)
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Expiring March 31, 2020 [Member]
Value investment owned, Appreciation/(Depreciation)				22,890
Futures Contracts | Baltic Exchange Capesize Time Charter Expiring January 31, 2020 [Member]
Value investment owned, Appreciation/(Depreciation)				10,915
Futures Contracts | Baltic Exchange Capesize Time Charter Expiring February 28, 2020 [Member]
Value investment owned, Appreciation/(Depreciation)				(41,165)
Futures Contracts | Baltic Exchange Capesize Time Charter Expiring March 31, 2020 [Member]
Value investment owned, Appreciation/(Depreciation)				(37,210)
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Due July 26, 2019
Value investment owned, Appreciation/(Depreciation)		25,015
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Due August 30, 2019
Value investment owned, Appreciation/(Depreciation)		$ 33,835
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Due September 27, 2019
Investment owned, Balance, Contracts | Number		30
Value investment owned, Appreciation/(Depreciation)		$ 31,945
Futures Contracts | Baltic Exchange Supramax T/C Average Shipping Route Expiring Due July 26, 2019
Value investment owned, Appreciation/(Depreciation)		(5,565)
Futures Contracts | Baltic Exchange Supramax T/C Average Shipping Route Expiring Due August 30, 2019
Value investment owned, Appreciation/(Depreciation)		5,250
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Due September 27, 2019
Value investment owned, Appreciation/(Depreciation)		$ 8,505
Futures Contracts | Baltic Capesize Time Charter Expiring July 26, 2019
Investment owned, Balance, Contracts | Number		40
Value investment owned, Appreciation/(Depreciation)		$ 104,930
Futures Contracts | Baltic Capesize Time Charter Expiring August 30, 2019
Value investment owned, Appreciation/(Depreciation)		92,090
Futures Contracts | Baltic Capesize Time Charter Expiring September 27, 2019
Value investment owned, Appreciation/(Depreciation)		95,410
Futures Contracts | Baltic Exchange Supramax Average Shipping Route Expiring March 31, 2020
Value investment owned, Appreciation/(Depreciation)				(5,750)
Futures Contracts | Baltic Exchange Supramax Average Shipping Route Expiring March 31, 2020
Value investment owned, Appreciation/(Depreciation)				(4,090)
Futures Contracts | Baltic Exchange Supramax Average Shipping Route Expiring January 31, 2020
Value investment owned, Appreciation/(Depreciation)				1,125
Short Futures Contracts
Value investment owned, Appreciation/(Depreciation)		(326,457)		15,878
Short Futures Contracts | US Treasury 2 Year Note
Value investment owned, Appreciation/(Depreciation)		(144,096)		11,221
Short Futures Contracts | US Treasury 5 Year Note
Value investment owned, Appreciation/(Depreciation)		(182,361)		4,657
Purchased Options
Investment owned, at Fair value		$ 35,625		$ 21,797
Purchased Options | US Treasury 10 Year Note
Investment owned, Balance, Contracts | Number		40		15
Investment owned, at Fair value		$ 35,625		$ 21,797
Written Options Contracts | US Treasury 5 Year Note
Investment owned, Balance, Contracts | Number		25
Investment owned, at Fair value		$ 19,336		19,336
Investments
Investment owned, at Fair value		13,005,522		6,084,345
Assets in Excess of Other Liabilities
Investment owned, at Fair value		3,222,889	[1]	1,962,922	[2]
Money Market Funds
Investment owned, at Fair value		1,378,163		718,180
Money Market Funds | First American US Treasury Obligations Fund Class X
Investment owned, at Fair value		1,095,625	[3]	551,232
Money Market Funds | First American US Treasury Money Market Fund Class Z
Investment owned, at Fair value		282,538	[3]	$ 166,948	[4]
Money Market Funds | BREAKWAVE DRY BULK SHIPPING ETF | First American US Treasury Obligations Fund Class X
Investment owned, Balance, Shares | shares				551,232
Investment owned, at Fair value				$ 551,232
Short-term Investments | US Treasury Securities
Investment owned, at Fair value		11,591,734	[1]	5,344,368
BREAKWAVE DRY BULK SHIPPING ETF
Investment owned, at Fair value		4,308,262		2,306,781
BREAKWAVE DRY BULK SHIPPING ETF | US Treasury Securities
Investment owned, at Fair value
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts
Value investment owned, Appreciation/(Depreciation)		$ 391,415		$ (105,125)
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Expiring January 31, 2020 [Member]
Investment owned, Balance, Contracts | Number				30
Value investment owned, Appreciation/(Depreciation)				$ (31,980)
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Expiring March 31, 2020 [Member]
Investment owned, Balance, Contracts | Number				30
Value investment owned, Appreciation/(Depreciation)				$ 22,890
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Capesize Time Charter Expiring January 31, 2020 [Member]
Investment owned, Balance, Contracts | Number				35
Value investment owned, Appreciation/(Depreciation)				$ 10,915
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Capesize Time Charter Expiring February 28, 2020 [Member]
Investment owned, Balance, Contracts | Number				35
Value investment owned, Appreciation/(Depreciation)				$ (41,165)
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Capesize Time Charter Expiring March 31, 2020 [Member]
Investment owned, Balance, Contracts | Number				35
Value investment owned, Appreciation/(Depreciation)				$ (37,210)
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Supramax T/C Average Shipping Route Expiring August 30, 2019
Investment owned, Balance, Contracts | Number				15
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Capesize Time Charter Expiring November 29, 2019
Investment owned, Balance, Contracts | Number				30
Value investment owned, Appreciation/(Depreciation)				$ 12,500
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Due July 26, 2019
Investment owned, Balance, Contracts | Number		30
Value investment owned, Appreciation/(Depreciation)		$ 25,015
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Due August 30, 2019
Investment owned, Balance, Contracts | Number		30
Value investment owned, Appreciation/(Depreciation)		$ 33,835
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Due September 27, 2019
Value investment owned, Appreciation/(Depreciation)		$ 31,945
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Supramax T/C Average Shipping Route Expiring Due July 26, 2019
Investment owned, Balance, Contracts | Number		10
Value investment owned, Appreciation/(Depreciation)		$ (5,565)
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Supramax T/C Average Shipping Route Expiring Due August 30, 2019
Investment owned, Balance, Contracts | Number		10
Value investment owned, Appreciation/(Depreciation)		$ 5,250
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Due September 27, 2019
Investment owned, Balance, Contracts | Number		10
Value investment owned, Appreciation/(Depreciation)		$ 8,505
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Capesize Time Charter Expiring July 26, 2019
Investment owned, Balance, Contracts | Number		30
Value investment owned, Appreciation/(Depreciation)		$ 104,930
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Capesize Time Charter Expiring August 30, 2019
Investment owned, Balance, Contracts | Number		30
Value investment owned, Appreciation/(Depreciation)		$ 92,090
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Capesize Time Charter Expiring September 27, 2019
Investment owned, Balance, Contracts | Number		30
Value investment owned, Appreciation/(Depreciation)		$ 95,410
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Supramax Average Shipping Route Expiring March 31, 2020
Investment owned, at Fair value
Value investment owned, Appreciation/(Depreciation)				$ (5,750)
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Supramax Average Shipping Route Expiring March 31, 2020
Investment owned, Balance, Contracts | Number				5
Investment owned, at Fair value
Value investment owned, Appreciation/(Depreciation)				$ (4,090)
BREAKWAVE DRY BULK SHIPPING ETF | Futures Contracts | Baltic Exchange Supramax Average Shipping Route Expiring January 31, 2020
Investment owned, Balance, Contracts | Number				5
Investment owned, at Fair value
Value investment owned, Appreciation/(Depreciation)				1,125
BREAKWAVE DRY BULK SHIPPING ETF | Short Futures Contracts
Investment owned, at Fair value
BREAKWAVE DRY BULK SHIPPING ETF | Short Futures Contracts | US Treasury 2 Year Note
Investment owned, at Fair value
BREAKWAVE DRY BULK SHIPPING ETF | Short Futures Contracts | US Treasury 5 Year Note
Investment owned, at Fair value
BREAKWAVE DRY BULK SHIPPING ETF | Purchased Options
Investment owned, at Fair value
BREAKWAVE DRY BULK SHIPPING ETF | Purchased Options | US Treasury 10 Year Note
Investment owned, at Fair value
BREAKWAVE DRY BULK SHIPPING ETF | Written Options Contracts | US Treasury 5 Year Note
Investment owned, at Fair value
BREAKWAVE DRY BULK SHIPPING ETF | Money Market Funds
Investment owned, at Fair value		1,095,625		551,232
BREAKWAVE DRY BULK SHIPPING ETF | Short-term Investments | US Treasury Securities
Investment owned, at Fair value
SIT RISING RATE ETF
Investment owned, at Fair value		11,920,149		5,740,486
SIT RISING RATE ETF | US Treasury Securities
Investment owned, at Fair value		11,591,734		5,344,368	[1]
SIT RISING RATE ETF | Short Futures Contracts
Value investment owned, Appreciation/(Depreciation)		$ (326,457)		$ 15,878
SIT RISING RATE ETF | Short Futures Contracts | US Treasury 2 Year Note
Investment owned, Balance, Contracts | Number		106		46
Value investment owned, Appreciation/(Depreciation)		$ (144,096)		$ 4,657
SIT RISING RATE ETF | Short Futures Contracts | US Treasury 5 Year Note
Investment owned, Balance, Contracts | Number		102		55
Value investment owned, Appreciation/(Depreciation)		$ (182,361)		$ 11,221
SIT RISING RATE ETF | Purchased Options
Investment owned, at Fair value		35,625		21,797
SIT RISING RATE ETF | Purchased Options | US Treasury 10 Year Note
Investment owned, at Fair value		$ 35,625		$ 21,797
SIT RISING RATE ETF | Written Options Contracts | US Treasury 5 Year Note
Investment owned, Balance, Contracts | Number		201		12
Investment owned, at Fair value		$ 19,336		$ (5,906)
SIT RISING RATE ETF | Investments
Investment owned, at Fair value		11,909,897		5,533,113
SIT RISING RATE ETF | Assets in Excess of Other Liabilities
Investment owned, at Fair value		10,252	[1]	207,373	[2]
SIT RISING RATE ETF | Money Market Funds
Investment owned, at Fair value		$ 697,615		$ 6,095,260
SIT RISING RATE ETF | Money Market Funds | First American US Treasury Money Market Fund Class Z
Investment owned, Balance, Shares | shares		282,538		166,948	[4]
Investment owned, at Fair value		$ 282,538		$ 166,948
SIT RISING RATE ETF | Short-term Investments | US Treasury Securities
Investment owned, at Fair value	[1]	11,591,734		5,344,368
BREAKWAVE DRY BULK SHIPPING ETF
Investment owned, at Fair value		4,308,262		2,306,781
BREAKWAVE DRY BULK SHIPPING ETF | Investments
Investment owned, at Fair value		1,249,009		551,232
BREAKWAVE DRY BULK SHIPPING ETF | Assets in Excess of Other Liabilities
Investment owned, at Fair value		$ 3,212,637	[1]	$ 1,755,549	[2]
BREAKWAVE DRY BULK SHIPPING ETF | Money Market Funds | First American US Treasury Obligations Fund Class X
Investment owned, Balance, Shares | shares		1,095,625
Investment owned, at Fair value		$ 1,095,625

[1] All or a portion of this security is held as collateral for futures contracts and written options.

[2] $-0- and $1,866,980, respectively, of cash is pledged as collateral for futures contracts

[3] Annualized seven-day yield as of June 30, 2019.

[4] Annualized seven-day yield as of December 31, 2019