For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

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+ Details

Fair Value Measurement of Assets and Liabilities (Details Textuals) (USD $)	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Auction Rate Securities [Member]	Sep. 30, 2010 Auction Rate Securities [Member]	Sep. 30, 2011 Collateralized Debt Obligations [Member]	Sep. 30, 2010 Collateralized Debt Obligations [Member]	Sep. 30, 2011 Structured investment vehicles [Member]	Sep. 30, 2010 Structured investment vehicles [Member]
Investment Holdings [Line Items]
Direct investments			$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Fair Value Measurement of Assets and Liabilities (Textuals) [Abstract]
Short-term and long-term investments	65,462,243	45,340,944
Non-financial assets or liabilities measured at fair value	$ 0	$ 0