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Investments (Details) (USD $)
Dec. 31, 2012
Sep. 30, 2012
Available-for-sale securities:    
Cost $ 5,487,397 $ 7,905,843
Gross Unrealized Gains 4,239 4,027
Gross Unrealized Losses (477) (4,643)
Fair Market Value 5,491,159 7,905,227
Corporate debt securities [Member] | Short-term [Member]
   
Available-for-sale securities:    
Cost 4,660,020 5,818,549
Gross Unrealized Gains 3,616 3,343
Gross Unrealized Losses (477) (2,355)
Fair Market Value 4,663,159 5,819,537
Corporate debt securities [Member] | Long-term [Member]
   
Available-for-sale securities:    
Cost 827,377 2,087,294
Gross Unrealized Gains 623 684
Gross Unrealized Losses   (2,288)
Fair Market Value $ 828,000 $ 2,085,690