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Investments (Schedule of Unrealized Loss on Investments) (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Investments [Abstract]
Aggregate Unrealized Losses, Less than one year	$ 250,974	$ 688,728
Aggregate Fair Value, Less than one year	$ 40,309,073	$ 22,887,686

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

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