Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net Income (Loss)	$ 2,419,763	$ 1,205,376
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Cost of securities purchased	(63,879,027)	(79,938,661)
Proceeds from securities sold and matured	54,000,000	73,497,316
Cost of affiliated investments purchased	(16,257,361)
Proceeds from affiliated investments sold	15,255,316
Net accretion of discount on United States Treasury Obligations	(110,547)	(54,058)
Net realized (gain) loss on United States Treasury Obligations and Affiliated Investments		(1,667)
Net change in unrealized (gain) loss on United States Treasury Obligations, Affiliated Investments and Currency Futures Contracts	(4,133)	263
Change in operating receivables and liabilities:
Variation margin	158,665	30,507
Dividends from affiliates	(878)
Management fee	2,810	(1,635)
Brokerage commissions and fees	493	461
Net cash provided by (used for) operating activities	(8,414,899)	(5,262,098)
Cash flows from financing activities:
Proceeds from purchases of Shares	8,413,425	17,343,128
Redemption of Shares		(17,549,535)
Net cash provided by (used for) financing activities	8,413,425	(206,407)
Net change in cash	(1,474)	(5,468,505)
Cash at beginning of period	168,928	6,561,288
Cash at end of period	167,454	1,092,783
Supplemental disclosure of cash flow information
Cash paid for interest	$ 178	$ 384