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Investments (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011
Available-for-sale securities:
Cost	$ 7,905,843	$ 10,614,723
Gross Unrealized Gains	4,027
Gross Unrealized Losses	(4,643)	(9,855)
Fair Market Value	7,905,227	10,604,868
Corporate debt securities [Member] | Short-term [Member]
Available-for-sale securities:
Cost	5,818,549	10,195,487
Gross Unrealized Gains	3,343
Gross Unrealized Losses	(2,355)	(7,849)
Fair Market Value	5,819,537	10,187,638
Corporate debt securities [Member] | Long-term [Member]
Available-for-sale securities:
Cost	2,087,294	419,236
Gross Unrealized Gains	684
Gross Unrealized Losses	(2,288)	(2,006)
Fair Market Value	$ 2,085,690	$ 417,230

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