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Investments (Schedule Of Unrealized Loss On Investments) (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Less Than One Year [Member]
Aggregate Unrealized Losses	$ (385,324)	$ (91,712)
Aggregate Fair Value	26,774,133	17,007,886
Greater Than One Year [Member]
Aggregate Unrealized Losses
Aggregate Fair Value

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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