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Investments - Summary of Short and Long-term Investments (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Investments [Line Items]
Gross Unrealized Gains	$ 7,500
Gross Unrealized Losses	(41,643)
Fair Value	10,698,271
Commercial notes (due within one year), amortized cost	9,030,261	106,500
Commercial notes (due after one year through two years, amortized cost	1,702,153
Total	10,732,414
Commercial Notes Due Within One Year
Schedule Of Investments [Line Items]
Gross Unrealized Gains	7,500
Gross Unrealized Losses	(39,281)
Fair Value	8,998,480
Commercial Notes Due After One Year Through Two Years
Schedule Of Investments [Line Items]
Gross Unrealized Gains
Gross Unrealized Losses	(2,362)
Fair Value	$ 1,699,791

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