6. STOCK-BASED COMPENSATION (Details) (USD $)	6 Months Ended
Jun. 30, 2013
Outstanding Options and Warrants Under the 2006 Plan and 2000 Plan
STOCK BASED COMPENSATION
Begining Balance	6,231,250
Granted
Exercised
Canceled or expired	(725,000)
Ending Balance	5,506,250
Exercisable at period end	4,916,250
Weighted Average Exercise price Per Common Share
Begining Balance	$ 3.58
Granted
Exercised
Canceled or expired	$ 6.82
Ending Balance	$ 3.16
Exercisable at period end	$ 3.19
Weighted Average Remaining Contractual Life
Ending Balance	1 year 7 months 10 days
Exercisable at period end	1 year 5 months 23 days
Aggregate Intrinsic Value
Ending Balance	$ 960,013
Exercisable at period end	894,879
Non-Plan Outstanding Warrants
STOCK BASED COMPENSATION
Begining Balance	1,502,898
Granted
Exercised	(1,172,898)
Canceled or expired
Ending Balance	330,000
Exercisable at period end	330,000
Weighted Average Exercise price Per Common Share
Begining Balance	$ 1.50
Granted
Exercised	$ 1.12
Canceled or expired
Ending Balance	$ 2.87
Exercisable at period end	$ 2.87
Weighted Average Remaining Contractual Life
Ending Balance	1 year 7 months 6 days
Exercisable at period end	1 year 7 months 6 days
Aggregate Intrinsic Value
Ending Balance	6,000
Exercisable at period end	$ 6,000

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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