(5) Marketable Securities (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Aggregate Fair Value	$ 9,805,890	$ 10,530,942
Cost or Amortized Cost	9,795,673	10,524,732
Net Unrealized Gains / (loss)	10,217	6,210
Government Securities Member
Aggregate Fair Value	8,415,761	8,328,392
Cost or Amortized Cost	8,406,217	8,324,372
Net Unrealized Gains / (loss)	9,544	4,020
Corporate Debt Securities Member
Aggregate Fair Value	1,390,129	2,202,550
Cost or Amortized Cost	1,389,456	2,200,360
Net Unrealized Gains / (loss)	$ 673	$ 2,190

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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