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Schedule of Investments (Unaudited) - Futures Contracts
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Contract
Dec. 31, 2019
USD ($)
Contract
Schedule Of Investments [Line Items]    
Currency Futures Contracts, Value $ 17,913,501 $ 24,330,410
Futures [Member]    
Schedule Of Investments [Line Items]    
Currency Futures Contracts, Value [1] (146,792) 139,989
Currency Futures Contracts, Unrealized Appreciation (Depreciation) [1] (146,792) 139,989
Futures [Member] | Long [Member]    
Schedule Of Investments [Line Items]    
Currency Futures Contracts, Value [1] (373,576) 384,629
Currency Futures Contracts, Unrealized Appreciation (Depreciation) [1] $ (373,576) $ 384,629
Futures [Member] | Long [Member] | Canadian, Dollars [Member]    
Schedule Of Investments [Line Items]    
Currency Futures Contracts, Number of Contracts | Contract 85 106
Currency Futures Contracts, Expiration Date Jun. 30, 2020 Mar. 31, 2020
Currency Futures Contracts, Notional Value $ 6,038,825 $ 8,171,010
Currency Futures Contracts, Value [1] (79,759) 126,797
Currency Futures Contracts, Unrealized Appreciation (Depreciation) [1] $ (79,759) $ 126,797
Futures [Member] | Long [Member] | New Zealand, Dollar [Member]    
Schedule Of Investments [Line Items]    
Currency Futures Contracts, Number of Contracts | Contract 101  
Currency Futures Contracts, Expiration Date Jun. 30, 2020  
Currency Futures Contracts, Notional Value $ 6,008,490  
Currency Futures Contracts, Value [1] (135,937)  
Currency Futures Contracts, Unrealized Appreciation (Depreciation) [1] $ (135,937)  
Futures [Member] | Long [Member] | Norwegian, Krone [Member]    
Schedule Of Investments [Line Items]    
Currency Futures Contracts, Number of Contracts | Contract 31 36
Currency Futures Contracts, Expiration Date Jun. 30, 2020 Mar. 31, 2020
Currency Futures Contracts, Notional Value $ 5,964,400 $ 8,203,680
Currency Futures Contracts, Value [1] (157,880) 257,832
Currency Futures Contracts, Unrealized Appreciation (Depreciation) [1] (157,880) 257,832
Futures [Member] | Short [Member]    
Schedule Of Investments [Line Items]    
Currency Futures Contracts, Value [1] 226,784 (244,640)
Currency Futures Contracts, Unrealized Appreciation (Depreciation) [1] $ 226,784 $ (244,640)
Futures [Member] | Short [Member] | Euro Member Countries, Euro [Member]    
Schedule Of Investments [Line Items]    
Currency Futures Contracts, Number of Contracts | Contract 44 58
Currency Futures Contracts, Expiration Date Jun. 30, 2020 Mar. 31, 2020
Currency Futures Contracts, Notional Value $ (6,077,225) $ (8,179,450)
Currency Futures Contracts, Value [1] 66,852 (68,342)
Currency Futures Contracts, Unrealized Appreciation (Depreciation) [1] $ 66,852 $ (68,342)
Futures [Member] | Short [Member] | Japanese, Yen [Member]    
Schedule Of Investments [Line Items]    
Currency Futures Contracts, Number of Contracts | Contract 52 70
Currency Futures Contracts, Expiration Date Jun. 30, 2020 Mar. 31, 2020
Currency Futures Contracts, Notional Value $ (6,057,675) $ (8,089,813)
Currency Futures Contracts, Value [1] 66,862 (38,503)
Currency Futures Contracts, Unrealized Appreciation (Depreciation) [1] $ 66,862 $ (38,503)
Futures [Member] | Short [Member] | Switzerland, Francs [Member]    
Schedule Of Investments [Line Items]    
Currency Futures Contracts, Number of Contracts | Contract 46 63
Currency Futures Contracts, Expiration Date Jun. 30, 2020 Mar. 31, 2020
Currency Futures Contracts, Notional Value $ (5,989,775) $ (8,190,000)
Currency Futures Contracts, Value [1] 93,070 (137,795)
Currency Futures Contracts, Unrealized Appreciation (Depreciation) [1] $ 93,070 $ (137,795)
[1] Unrealized Appreciation (Depreciation) and Value are presented above, net by contract.