Statement of Changes in Shareholders' Equity - USD ($)	Total	General Shares [Member]	Shares [Member]
Balance - Value at Dec. 31, 2013	$ 65,026,014	$ 1,084	$ 65,024,930
Balance - Shares at Dec. 31, 2013		40	2,400,000
Purchases of Shares - Value	25,084,125		$ 25,084,125
Purchases of Shares - Shares			1,000,000
Redemption of Shares - Value	(40,014,869)		$ (40,014,869)
Redemption of Shares - Shares			(1,600,000)
Net Increase (Decrease) due to Share Transactions, value	(14,930,744)		$ (14,930,744)
Net Increase (Decrease) due to Share Transactions, shares			(600,000)
Net Income (Loss)
Net Investment Income (Loss)	(443,974)	$ (8)	$ (443,966)
Net Realized Gain (Loss) on United States Treasury Obligations and Currency Futures Contracts	(5,820,853)	(106)	(5,820,747)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations and Currency Futures Contracts	(1,041,739)	(19)	(1,041,720)
Net Income (Loss)	(7,306,566)	(133)	(7,306,433)
Net Change in Shareholders' Equity, value	(22,237,310)	(133)	$ (22,237,177)
Net Change in Shareholders' Equity, shares			(600,000)
Balance - Value at Dec. 31, 2014	42,788,704	$ 951	$ 42,787,753
Balance - Shares at Dec. 31, 2014		40	1,800,000
Purchases of Shares - Value	34,873,999		$ 34,873,999
Purchases of Shares - Shares			1,600,000
Redemption of Shares - Value	(35,228,697)		$ (35,228,697)
Redemption of Shares - Shares			(1,600,000)
Net Increase (Decrease) due to Share Transactions, value	(354,698)		$ (354,698)
Net Income (Loss)
Net Investment Income (Loss)	(312,963)	$ (7)	(312,956)
Net Realized Gain (Loss) on United States Treasury Obligations and Currency Futures Contracts	(4,150,446)	(101)	(4,150,345)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations and Currency Futures Contracts	595,180	14	595,166
Net Income (Loss)	(3,868,229)	(94)	(3,868,135)
Net Change in Shareholders' Equity, value	(4,222,927)	(94)	(4,222,833)
Balance - Value at Dec. 31, 2015	38,565,777	$ 857	$ 38,564,920
Balance - Shares at Dec. 31, 2015		40	1,800,000
Purchases of Shares - Value	17,343,128		$ 17,343,128
Purchases of Shares - Shares			800,000
Redemption of Shares - Value	(21,698,973)		$ (21,698,973)
Redemption of Shares - Shares			(1,000,000)
Net Increase (Decrease) due to Share Transactions, value	(4,355,845)		$ (4,355,845)
Net Increase (Decrease) due to Share Transactions, shares			(200,000)
Net Income (Loss)
Net Investment Income (Loss)	(201,054)	$ (5)	$ (201,049)
Net Realized Gain (Loss) on United States Treasury Obligations and Currency Futures Contracts	(1,762,191)	(46)	(1,762,145)
Net Change in Unrealized Gain (Loss) on United States Treasury Obligations and Currency Futures Contracts	502,452	13	502,439
Net Income (Loss)	(1,460,793)	(38)	(1,460,755)
Net Change in Shareholders' Equity, value	(5,816,638)	(38)	$ (5,816,600)
Net Change in Shareholders' Equity, shares			(200,000)
Balance - Value at Dec. 31, 2016	$ 32,749,139	$ 819	$ 32,748,320
Balance - Shares at Dec. 31, 2016		40	1,600,000