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Combined Schedules of Investments (Parenthetical) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2019
Mar. 31, 2020
SIT RISING RATE ETF    
Investment owned, Percent of net assets 100.00% 100.00%
BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Percent of net assets 100.00% 100.00%
Purchased Options | SIT RISING RATE ETF    
Investment owned, Percent of net assets   (0.40%)
Purchased Options | U.S. Treasury 10 Year Note | SIT RISING RATE ETF    
Investment owned, Subject to option, Price $ 123.50 $ 138.00
Investment owned, Subject to option, Exercise dates 08/23/2019 05/22/2020
Investment owned, at cost $ 58,883 $ 51,053
Investment owned, Percent of net assets 0.30% 0.30%
Purchased Options | U.S. Treasury 10 Year Note | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at cost   $ 0
Investment owned, Percent of net assets 2.082% 0.00%
Written Options Contracts | SIT RISING RATE ETF    
Investment owned, Percent of net assets   0.00%
Written Options Contracts | U.S. Treasury 5 Year Note | SIT RISING RATE ETF    
Investment owned, Subject to option, Price $ 117.75 $ 120.25
Investment owned, Subject to option, Exercise dates 08/23/2019 05/22/2020
Investment owned premiums received $ 16,128 $ 637
Written Options Contracts | U.S. Treasury 5 Year Note One [Member] | SIT RISING RATE ETF    
Investment owned, Subject to option, Price   $ 124.25
Investment owned, Subject to option, Exercise dates   05/22/2020
Investment owned premiums received   $ 8,190
Short Futures Contracts | U.S. Treasury 10 Year Note | SIT RISING RATE ETF    
Investment owned, at cost 11,586,722 4,827,111
Investment owned, Principal amount 11,700,000 4,850,000 [1]
Short Futures Contracts | U.S. Treasury 5 Year Note | SIT RISING RATE ETF    
Investment owned, Principal amount 12,051,938 4,889,016
Short Futures Contracts | U.S. Treasury 2 Year Note | SIT RISING RATE ETF    
Investment owned, Principal amount 22,809,047 10,798,758
Money Market Funds | SIT RISING RATE ETF    
Investment owned, at cost $ 282,538 $ 8,737
Investment owned, Percent of net assets 1.40% 0.20%
Money Market Funds | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at cost $ 1,095,625 $ 551,232
Investment owned, Percent of net assets 25.40% 13.80%
Money Market Funds | First American US Treasury Money Market Fund Class Z | SIT RISING RATE ETF    
Investment owned, at cost $ 282,538 $ 8,737
Investment owned, Percent of net assets 2.40% [2] 0.37% [3]
Money Market Funds | First American US Treasury Obligations Fund Class X | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at cost $ 1,095,625 $ 2,556,475
Investment owned, Percent of net assets 2.27% [2] 0.32% [3]
Investments    
Investment futures contracts   $ 0
Investments | SIT RISING RATE ETF    
Investment owned, at cost $ 11,928,143 $ 4,886,901
Investment owned, Percent of net assets 99.90% 94.90%
Investments | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at cost $ 1,095,625 $ 2,556,475
Investment owned, Percent of net assets 25.40% 13.80%
Other Assets in Excess of Liabilities | SIT RISING RATE ETF    
Investment owned Percent of other liabilities 0.10% 5.10% [4]
Other Assets in Excess of Liabilities | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned Percent of other liabilities 74.60% 86.20% [4]
Short-term Investments | SIT RISING RATE ETF    
Investment owned, Percent of net assets 97.20% 94.40%
Short-term Investments | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Percent of net assets 0.00% 0.00%
Short-term Investments | U.S. Treasury 10 Year Note | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at cost   $ 0
Investment owned, Percent of net assets [1]   0.0763%
Futures Contracts    
Investment futures contracts   $ 14,744,021
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Expiring April 30, 2020 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount   1,539,955
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Expiring May 29, 2020 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount   1,592,430
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Expiring June 30, 2020 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount   1,748,880
Futures Contracts | Baltic Exchange Supramax Average Shipping Route Expiring April 30, 2020 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount   897,760
Futures Contracts | Baltic Exchange Supramax Average Shipping Route Expiring May 29, 2020 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount   613,415
Futures Contracts | Baltic Exchange Supramax Average Shipping Route Expiring June 30, 2020 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount   661,580
Futures Contracts | Baltic Capesize Time Charter Expiring April 30, 2020 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount   2,444,970
Futures Contracts | Baltic Capesize Time Charter Expiring May 29, 2020 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount   2,752,625
Futures Contracts | Baltic Capesize Time Charter Expiring June 30, 2020 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount   $ 3,221,715
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Due July 26, 2019 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount $ 489,015  
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Due August 30, 2019 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount 497,835  
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Due September 27, 2019 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount 495,945  
Futures Contracts | Baltic Exchange Supramax T/C Average Shipping Route Expiring Due July 26, 2019 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount 147,435  
Futures Contracts | Baltic Exchange Supramax T/C Average Shipping Route Expiring Due August 30, 2019 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount 158,250  
Futures Contracts | Baltic Exchange Supramax T/C Average Shipping Route Expiring September 27, 2019 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount 161,505  
Futures Contracts | Baltic Capesize Time Charter Expiring July 26, 2019 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount 732,680  
Futures Contracts | Baltic Capesize Time Charter Expiring August 30, 2019 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount 719,840  
Futures Contracts | Baltic Capesize Time Charter Expiring September 27, 2019 | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, Principal amount $ 723,160  
[1] All or a portion of this security is held as collateral for futures contracts and written options.
[2] Annualized seven-day yield as of June 30, 2019.
[3] Annualized seven-day yield as of March 31, 2020
[4] $-0- and $14,726,645, respectively, of cash is pledged as collateral for futures contracts