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Combined Schedules of Investments
 3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
Number
shares
Mar. 31, 2020
USD ($)
Number
shares
Investment owned, at Fair value $ 16,228,411 $ 23,652,537
US Treasury Securities    
Investment owned, at Fair value   4,848,915
Investment owned, Balance, Principal amount 11,591,734 4,848,915
BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at Fair value 4,308,262 18,518,866
BREAKWAVE DRY BULK SHIPPING ETF | US Treasury Securities    
Investment owned, at Fair value
SIT RISING RATE ETF    
Investment owned, at Fair value 11,920,149 5,133,671
SIT RISING RATE ETF | US Treasury Securities    
Investment owned, at Fair value 11,591,734 4,848,915 [1]
BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at Fair value 4,308,262 18,518,866
Futures Contracts    
Value investment owned, Appreciation/(Depreciation) 81,680 (1,976,295)
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Expiring April 30, 2020 [Member]    
Value investment owned, Appreciation/(Depreciation)   (598,920)
Futures Contracts | Baltic Capesize Time Charter Expiring May 29, 2020 [Member]    
Value investment owned, Appreciation/(Depreciation)   (395,195)
Futures Contracts | Baltic Exchange Panamax T/C Average Shipping Route Index Expiring June 30, 2020 [Member]    
Value investment owned, Appreciation/(Depreciation)   (246,245)
Futures Contracts | Baltic Exchange Capesize Time Charter Expiring April 30, 2020 [Member]    
Value investment owned, Appreciation/(Depreciation)   (340,115)
Futures Contracts | Baltic Exchange Capesize Time Charter Expiring May 29, 2020 [Member]    
Value investment owned, Appreciation/(Depreciation)   (210,460)
Futures Contracts | Baltic Exchange Capesize Time Charter Expiring June 30, 2020 [Member]    
Value investment owned, Appreciation/(Depreciation)   (162,295)
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 45  
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 Capesize Time Charter Expiring May 29, 2020 [Member]    
Value investment owned, Appreciation/(Depreciation)   (56,250)
Futures Contracts | Baltic Capesize Time Charter Expiring April 30, 2020    
Value investment owned, Appreciation/(Depreciation)   (313,655)
Futures Contracts | Baltic Capesize Time Charter Expiring June 30, 2020 [Member]    
Value investment owned, Appreciation/(Depreciation)   $ 346,840
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF    
Value investment owned, Appreciation/(Depreciation) $ 391,415  
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Panamax T/C Average Shipping Route Index Expiring April 30, 2020 [Member]    
Investment owned, Balance, Contracts | Number   235
Value investment owned, Appreciation/(Depreciation)   $ (598,920)
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Capesize Time Charter Expiring May 29, 2020 [Member]    
Value investment owned, Appreciation/(Depreciation)   $ (395,195)
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Panamax T/C Average Shipping Route Index Expiring June 30, 2020 [Member]    
Investment owned, Balance, Contracts | Number   210
Value investment owned, Appreciation/(Depreciation)   $ (246,245)
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Capesize Time Charter Expiring April 30, 2020 [Member]    
Investment owned, Balance, Contracts | Number   35
Value investment owned, Appreciation/(Depreciation)   $ (340,115)
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Capesize Time Charter Expiring May 29, 2020 [Member]    
Investment owned, Balance, Contracts | Number   95
Value investment owned, Appreciation/(Depreciation)   $ (210,460)
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Capesize Time Charter Expiring June 30, 2020 [Member]    
Investment owned, Balance, Contracts | Number   95
Value investment owned, Appreciation/(Depreciation)   $ (162,295)
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Supramax T/C Average Shipping Route Expiring August 30, 2019    
Investment owned, Balance, Contracts | Number   15
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Capesize Time Charter Expiring November 29, 2019    
Investment owned, Balance, Contracts | Number   210
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Panamax T/C Average Shipping Route Index Due July 26, 2019    
Investment owned, Balance, Contracts | Number 45  
Value investment owned, Appreciation/(Depreciation) $ 25,015  
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Panamax T/C Average Shipping Route Index Due August 30, 2019    
Investment owned, Balance, Contracts | Number 45  
Value investment owned, Appreciation/(Depreciation) $ 33,835  
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Panamax T/C Average Shipping Route Index Due September 27, 2019    
Value investment owned, Appreciation/(Depreciation) $ 31,945  
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Supramax T/C Average Shipping Route Expiring Due July 26, 2019    
Investment owned, Balance, Contracts | Number 45  
Value investment owned, Appreciation/(Depreciation) $ (5,565)  
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | 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  
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Panamax T/C Average Shipping Route Index Due September 27, 2019    
Investment owned, Balance, Contracts | Number 45  
Value investment owned, Appreciation/(Depreciation) $ 8,505  
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Capesize Time Charter Expiring July 26, 2019    
Investment owned, Balance, Contracts | Number 30  
Value investment owned, Appreciation/(Depreciation) $ 104,930  
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Capesize Time Charter Expiring August 30, 2019    
Investment owned, Balance, Contracts | Number 30  
Value investment owned, Appreciation/(Depreciation) $ 92,090  
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Capesize Time Charter Expiring September 27, 2019    
Investment owned, Balance, Contracts | Number 30  
Value investment owned, Appreciation/(Depreciation) $ 95,410  
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Supramax Average Shipping Route Expiring March 31, 2020    
Value investment owned, Appreciation/(Depreciation)   $ 19,336
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Exchange Supramax Average Shipping Route Expiring January 31, 2020    
Value investment owned, Appreciation/(Depreciation)   1,125
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Capesize Time Charter Expiring May 29, 2020 [Member]    
Value investment owned, Appreciation/(Depreciation)   (56,250)
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Capesize Time Charter Expiring April 30, 2020    
Value investment owned, Appreciation/(Depreciation)   (313,655)
Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | Baltic Capesize Time Charter Expiring June 30, 2020 [Member]    
Value investment owned, Appreciation/(Depreciation)   346,840
Short Futures Contracts    
Value investment owned, Appreciation/(Depreciation) (326,457) (400,059)
Short Futures Contracts | US Treasury 2 Year Note    
Value investment owned, Appreciation/(Depreciation) (144,096) (199,694)
Short Futures Contracts | US Treasury 5 Year Note    
Value investment owned, Appreciation/(Depreciation) (182,361) (200,365)
Short Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at Fair value  
Short Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | US Treasury 2 Year Note    
Investment owned, at Fair value  
Short Futures Contracts | BREAKWAVE DRY BULK SHIPPING ETF | US Treasury 5 Year Note    
Investment owned, at Fair value  
Short Futures Contracts | SIT RISING RATE ETF    
Value investment owned, Appreciation/(Depreciation) $ (326,457) $ (400,059)
Short Futures Contracts | SIT RISING RATE ETF | US Treasury 2 Year Note    
Investment owned, Balance, Contracts | Number 106 46
Value investment owned, Appreciation/(Depreciation) $ (144,096) $ (200,365)
Short Futures Contracts | SIT RISING RATE ETF | US Treasury 5 Year Note    
Investment owned, Balance, Contracts | Number 102 55
Value investment owned, Appreciation/(Depreciation) $ (182,361) $ (199,694)
Purchased Options    
Investment owned, at Fair value $ 35,625 $ 16,000
Purchased Options | US Treasury 10 Year Note    
Investment owned, Balance, Contracts | Number 40 16
Investment owned, at Fair value $ 35,625 $ 16,000
Purchased Options | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at Fair value
Purchased Options | BREAKWAVE DRY BULK SHIPPING ETF | US Treasury 10 Year Note    
Investment owned, at Fair value  
Purchased Options | SIT RISING RATE ETF    
Investment owned, at Fair value 35,625 16,000
Purchased Options | SIT RISING RATE ETF | US Treasury 10 Year Note    
Investment owned, at Fair value $ 35,625 16,000
Written Options Contracts | US Treasury 5 Year Note    
Investment owned, Balance, Contracts | Number 25  
Investment owned, at Fair value $ (19,336) 19,336
Written Options Contracts | BREAKWAVE DRY BULK SHIPPING ETF | US Treasury 5 Year Note    
Investment owned, at Fair value  
Written Options Contracts | SIT RISING RATE ETF | US Treasury 5 Year Note    
Investment owned, Balance, Contracts | Number 25 12
Investment owned, at Fair value $ (19,336) $ (13,672)
Investments    
Investment owned, at Fair value 13,005,522 7,430,127
Investments | SIT RISING RATE ETF    
Investment owned, at Fair value 11,909,897 4,873,652
Investments | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at Fair value 1,249,009 2,556,475
Assets in Excess of Other Liabilities    
Investment owned, at Fair value 3,222,889 [1] 16,222,410 [2]
Assets in Excess of Other Liabilities | SIT RISING RATE ETF    
Investment owned, at Fair value 10,252 [1] 260,019 [2]
Assets in Excess of Other Liabilities | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at Fair value 3,212,637 [1] 15,962,391 [2]
Money Market Funds    
Investment owned, at Fair value 1,378,163 2,565,212
Money Market Funds | First American US Treasury Obligations Fund Class X    
Investment owned, at Fair value 1,095,625 [3] 2,556,475
Money Market Funds | First American US Treasury Money Market Fund Class Z    
Investment owned, at Fair value [3] 282,538 $ 8,737
Money Market Funds | BREAKWAVE DRY BULK SHIPPING ETF | First American US Treasury Obligations Fund Class X    
Investment owned, Balance, Shares | shares   2,556,475
Investment owned, at Fair value   $ 2,556,475
Money Market Funds | BREAKWAVE DRY BULK SHIPPING ETF    
Investment owned, at Fair value 1,095,625 2,556,475
Money Market Funds | SIT RISING RATE ETF    
Investment owned, at Fair value $ 697,615 $ 8,737
Money Market Funds | SIT RISING RATE ETF | First American US Treasury Money Market Fund Class Z    
Investment owned, Balance, Shares | shares 282,538 8,737 [4]
Investment owned, at Fair value $ 282,538 $ 8,737
Money Market Funds | BREAKWAVE DRY BULK SHIPPING ETF | First American US Treasury Obligations Fund Class X    
Investment owned, Balance, Shares | shares 1,095,625  
Investment owned, at Fair value $ 1,095,625  
Short-term Investments | US Treasury Securities    
Investment owned, at Fair value 11,591,734 [1] 4,848,915
Short-term Investments | BREAKWAVE DRY BULK SHIPPING ETF | US Treasury Securities    
Investment owned, at Fair value
Short-term Investments | SIT RISING RATE ETF | US Treasury Securities    
Investment owned, at Fair value [1] $ 11,591,734 $ 4,848,915
[1] All or a portion of this security is held as collateral for futures contracts and written options.
[2] $-0- and $14,744,021, 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 March 31, 2020