9. Stockholders' Equity (Details) (USD $)	6 Months Ended
Jun. 30, 2012
Stockholders Equity Details
Number of Options Outstanding, Beginning	393,865
Number of Options Granted	0
Number of Options Exercised	(95,000)
Number of Options Forfeited	0
Number of Options Outstanding, Ending	298,865
Number of Options Exercisable	221,648
Weighted Average Exercise Price Outstanding, Beginning	$ 2.32
Weighted Average Exercise Price Granted	$ 0
Weighted Average Exercise Price Exercised	$ 2.12
Weighted Average Exercise Price Forfeited	$ 0
Weighted Average Exercise Price Outstanding, Ending	$ 2.39
Weighted Average Exercise Price Exercisable	$ 2.37
Weighted Average Remaining Contractual Life (in years) Outstanding	2 years 4 months 21 days
Weighted Average Remaining Contractual Life (in years) Exercisable	2 years 4 months 13 days
Aggregate Intrinsic Value Outstanding, Beginning	$ 498,913
Aggregate Intrinsic Value Granted	$ 0
Aggregate Intrinsic Value Exercised	243,075
Aggregate Intrinsic Value Forfeited/canceled	$ 0
Aggregate Intrinsic Value Outstanding, Ending	852,540
Aggregate Intrinsic Value Exercisable	$ 636,616

No authoritative reference available.

No definition available.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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The combined weighted average of the accumulated differences between the fair values on underlying shares and exercises prices to acquire such shares as of the grant date on options that were either forfeited or lapsed.

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The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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