Cash, Cash Equivalents, and Investments (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Summary of cash, cash equivalents and held-to-maturity investments by type
Cost	$ 38,580,384	$ 37,807,749
Gross Unrealized Gains
Gross Unrealized Losses		(1,488)
Fair Value	38,580,384	37,806,261
Cash and money market funds [Member]
Summary of cash, cash equivalents and held-to-maturity investments by type
Cost	38,580,384	36,126,791
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	38,580,384	36,126,791
Corporate bonds [Member]
Summary of cash, cash equivalents and held-to-maturity investments by type
Cost		958
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value		958
Certificate of deposit [Member]
Summary of cash, cash equivalents and held-to-maturity investments by type
Cost		1,680,000
Gross Unrealized Gains
Gross Unrealized Losses		(1,488)
Fair Value		$ 1,678,512

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity.

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- Definition

As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

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- Definition

As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

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