Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net Income (Loss)		$ (1,460,793)	$ (3,868,229)	$ (7,306,566)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Cost of securities purchased		(153,852,506)	(165,980,133)	(223,982,840)
Proceeds from securities sold and matured		159,492,191	171,498,561	241,999,608
Net sales (purchases) of affiliated investments		(1,502,575)
Net accretion of discount on United States Treasury Obligations		(117,783)	(12,584)	(19,747)
Net realized (gain) loss on United States Treasury Obligations		(1,262)	415	(700)
Net change in unrealized (gain) loss on United States Treasury Obligations and Currency Futures Contracts		4,331	(595,180)	1,041,739
Cash transfer to Commodity Broker to satisfy variation margin requirements (Note 4)			(2,052,858)
Cash received (paid) to Commodity Broker to satisfy open variation margin, net (Note 4)			1,658,499
Change in operating receivables and liabilities:
Variation margin		(290,309)	156,009
Dividends from affiliates		(452)
Management fee		(6,220)	(18,031)	5,250
Brokerage commissions and fees		627	(1,428)	2,802
Net cash provided by (used for) operating activities		2,265,249	785,041	11,739,546
Cash flows from financing activities:
Proceeds from purchases of Shares		17,343,128	34,873,999	25,084,125
Redemption of Shares		(26,000,737)	(30,926,933)	(40,014,869)
Net cash provided by (used for) financing activities		(8,657,609)	3,947,066	(14,930,744)
Net change in cash		(6,392,360)	4,732,107	(3,191,198)
Cash at beginning of period	[1],[2]	6,561,288	1,829,181	5,020,379
Cash at end of period	[1],[2]	168,928	6,561,288	1,829,181
Supplemental disclosure of cash flow information
Cash paid for interest		$ 761	$ 1,012	$ 21

[1] Cash at December 31, 2014 and prior reflects cash held by the Predecessor Commodity Broker.

[2] Cash at December 31, 2016 and 2015 reflects cash held by the Custodian.