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Statements of Assets and Liabilities (Parenthetical) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Statements of Assets and Liabilities [Abstract]    
Common stock, shares authorized unlimited unlimited [1]
Net asset value per share $ 129.05 [2] $ 118.14 [1]
Common stock, shares issued 8,600,000 8,750,000 [1]
Common stock, shares outstanding 8,600,000 8,750,000 [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2013.
[2] Effective January 1, 2014, the Trust has adopted the provisions of Topic 946, Investment Companies, and follows specialized accounting. Refer to Note 2.1 for additional information.