Statements of Income and Expenses - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income
Interest Income	$ 7,794,759	$ 4,793,315	$ 2,271,490
Dividends from Affiliates	1,848,304	793,980	50,015
Total Income	9,643,063	5,587,295	2,321,505
Expenses
Management Fees	3,972,128	4,976,113	6,349,708
Brokerage Commissions and Fees	120,918	137,810	209,040
Interest Expense	20,856	9,086	14,496
Total Expenses	4,113,902	5,123,009	6,573,244
Less: Waivers	(114,990)	(88,610)	(25,204)
Net Expenses	3,998,912	5,034,399	6,548,040
Net Investment Income (Loss)	5,644,151	552,896	(4,226,535)
Net Realized Gain (Loss) on
United States Treasury Obligations	(26,350)	(7,094)	3,553
Currency Futures Contracts	29,619,708	(51,958,105)	38,971,461
Net Realized Gain (Loss)	29,593,358	(51,965,199)	38,975,014
Net Change in Unrealized Gain (Loss) on
United States Treasury Obligations	45,626	(14,657)	(59,876)
Affiliated Investments	128,690	(317,334)
Currency Futures Contracts	3,438,120	(9,961,447)	(7,087,803)
Net Change in Unrealized Gain (Loss)	3,612,436	(10,293,438)	(7,147,679)
Net Realized and Net Change in Unrealized Gain (Loss) on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	33,205,794	(62,258,637)	31,827,335
Net Income (Loss)	$ 38,849,945	$ (61,705,741)	$ 27,600,800