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Note 9 - Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure Text Block Supplement [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		Year ended December 31,
		2013				2012				2011
Volatility			69.4	%			52.1	%			73.7	%
Risk-free interest rate			1.1	%			0.5	%			0.8	%
Expected life (in years)			4.0				4.0				4.0
Dividend yield			—	%			—	%			—	%
The weighted average grant date fair value for options issued, with the exercise price equal to market value on the date of grant		$	4.52			$	2.24			$	1.52

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

		Year ended December 31, 2013								Year ended December 31, 2012								Year ended December 31, 2011
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share
Outstanding, beginning of year			2,148,170			$	2.56,				2,186,511			$	2.28				2,068,063			$	2.24
Granted			180,375				8.36				194,750				5.44				176,500				2.96
Exercised			(890,033	)			1.80				(191,585	)			2.20				(18,427	)			1.72
Forfeited			(29,684	)			4.88				(40,751	)			3.20				(24,625	)			2.76
Expired			(1,189	)			1.44				(755	)			1.76				(15,000	)			3.20
Outstanding, end of year			1,407,639			$	3.80				2,148,170			$	2.56				2,186,511			$	2.28
Options exercisable, end of year			1,045,475			$	3.14				1,772,723			$	2.28				1,760,604			$	2.16

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

													Options outstanding																Options exercisable
	Exercise price												Number outstanding				Weighted average exercise price per share				Weighted average remaining contractual life (years)				Aggregate intrinsic value				Number exercisable				Weighted average exercise price per share				Aggregate intrinsic value
	$	1.52				-			$	2.40				335,029			$	2.32				0.9			$	3,911,669				335,029			$	2.32			$	3,911,669
	$	2.48				-			$	2.80				379,135			$	2.75				3.0				4,264,512				302,472			$	2.74				3,405,886
	$	2.92				-			$	3.76				339,041			$	3.21				2.0				3,658,099				288,867			$	3.26				3,102,171
	$	4.20				-			$	10.16				354,434			$	6.86				5.5				2,530,230				119,107			$	6.13				937,590
														1,407,639			$	3.80							$	14,364,510				1,045,475			$	3.14			$	11,357,316

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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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

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

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