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Stock options (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]

The fair value of stock options is estimated on the date of grant using the Black-Scholes option pricing model. The weighted average fair values of the options granted and weighted average assumptions are as follows:

		For the Years Ended December 31,
		2012				2011				2010
Weighted average fair value of options granted		$	2.32			$	1.61			$	3.04
Risk-free interest rate			0.65%-0.74%				0.9%-2.8%				2.5%-3.2%
Expected life (years)			5				5-8				8
Expected volatility factor			69	%			68%-74%				90	%
Expected dividends			None				None				None

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of option activity under the Plans as of December 31, 2012, and changes during the year then ended is presented below:

		Number of Options				Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Term (years)				Aggregate Intrinsic Value
Outstanding at January 1, 2012			3,478,329			$	2.73
Granted			90,000			$	4.19
Exercised			(231,772	)		$	3.21
Forfeited/Expired			(350,500	)		$	2.64
Outstanding at December 31, 2012			2,986,057			$	2.75				4.34			$	3,229,575
Exercisable at December 31, 2012			1,426,057			$	2.74				2.39			$	1,607,575
Vested and expected to vest at
December 31, 2012			2,986,057			$	2.75				4.34			$	3,229,575

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

A summary of restricted shares under the Company’s stock option plans as of December 31, 2012, and changes during the period then ended, are presented below:

		Number of Shares				Weighted-Average Grant Date Fair Value
Unvested at January 1, 2012			60,000			$	3.49
Granted			-				-
Vested			(27,500	)			3.90
Forfeited/Expired			—				-
Unvested at December 31, 2012			32,500			$	3.14

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

+ References

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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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