Quarterly report pursuant to Section 13 or 15(d)

Treasury Bills - Treasury Bills Classified as Available-for-sale Securities Re-Measured on a Recurring Basis (Detail)

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Treasury Bills - Treasury Bills Classified as Available-for-sale Securities Re-Measured on a Recurring Basis (Detail)
Jun. 30, 2015
USD ($)
Schedule of Available-for-sale Securities [Line Items]  
Fair Value $ 5,550,283
US Treasury Bill Securities [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Cost 5,551,383
Fair Value 5,550,283
Unrealized Gain (Loss) $ 1,100