8. Stockholders' Equity (Details) (USD $)	6 Months Ended
Jun. 30, 2014
Stockholders Equity Details
Number of Options Outstanding, Beginning	321,365
Number of Options Granted	0
Number of Options Exercised	(58,865)
Number of Options Forfeited	0
Number of Options Outstanding, Ending	262,500
Number of Options Vested and Exercisable	185,625
Weighted Average Exercise Price Outstanding, Beginning	$ 3.36
Weighted Average Exercise Price Granted	$ 0
Weighted Average Exercise Price Exercised	$ 2.45
Weighted Average Exercise Price Forfeited	$ 0
Weighted Average Exercise Price Outstanding, Ending	$ 3.56
Weighted Average Exercise Price Vested and Exercisable	$ 2.87
Weighted Average Remaining Contractual Life (in years) Outstanding Beginning	2 years 3 months 4 days
Weighted Average Remaining Contractual Life (in years) Outstanding Ending	2 years 15 days
Weighted Average Remaining Contractual Life (in years) Vested and Exercisable	1 year 2 months 1 day
Aggregate Intrinsic Value Outstanding, Beginning	$ 1,257,936
Aggregate Intrinsic Value Granted	$ 0
Aggregate Intrinsic Value Exercised	248,179
Aggregate Intrinsic Value Forfeited/canceled	$ 0
Aggregate Intrinsic Value Outstanding, Ending	816,650
Aggregate Intrinsic Value Vested and Exercisable	$ 705,650

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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