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		$ 35,811,220	$ 50,761,295
Short [Member] | Futures [Member] | ICE U.S. Dollar Index [Member]
Schedule Of Investments [Line Items]
Currency Futures Contracts, Number of Contracts | Contract		363	421
Currency Futures Contracts, Expiration Date		Jun. 30, 2020	Mar. 31, 2020
Currency Futures Contracts, Notional Value		$ (35,970,363)	$ (40,440,418)
Currency Futures Contracts, Value	[1]	(813,665)	315,919
Currency Futures Contracts, Unrealized Appreciation (Depreciation)	[1]	$ (813,665)	$ 315,919

[1] Unrealized Appreciation (Depreciation) and Value are presented above, net by contract.