Statements of Financial Condition - USD ($)		Dec. 31, 2017	Dec. 31, 2016
Assets
United States Treasury Obligations, at value (cost $142,800,664 and $183,843,172, respectively)		$ 142,797,721	$ 183,837,528
Affiliated investments, at value (cost $33,304,228 and $9,388,271, respectively)		33,284,413	9,388,271
Other investments:
Variation margin receivable- Commodity Futures Contracts		1,212,368	112,741
Cash held by custodian	[1]	856,046
Receivable for:
Dividends from affiliates		9,572	2,258
Total assets		178,160,120	193,340,798
Payable for:
Due to custodian			500
Management fees		106,161	122,985
Brokerage commissions and fees		5,020	2,576
Total liabilities		111,181	126,061
Commitments and Contingencies (Note 10)
Equity
Shareholder's equity—General Shares		584	552
Shareholders' equity—Shares		178,048,355	193,214,185
Total shareholders' equity		178,048,939	193,214,737
Total liabilities and equity		$ 178,160,120	$ 193,340,798
General Shares outstanding		40	40
Shares outstanding		12,200,000	14,000,000
Net asset value per share		$ 14.59	$ 13.80
Market value per share		$ 14.54	$ 13.79

[1] Cash at December 31, 2017, 2016 and 2015 reflects cash held by the Custodian.