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Note 14 - Share-based Payments (Tables)

6 Months Ended

Jun. 30, 2016

Notes Tables

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

		Three months ended June 30 ,  2016								Three months ended June 30 , 2015
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share
Outstanding, beginning of period			550,641			$	10.48				943,323			$	6.23
Granted			8,000				23.37				-				-
Exercised			(51,963	)			3.52				(112,656	)			2.66
Forfeited			(4,088	)			23.83				(1,716	)			13.15
Expired			-				-				(1,875	)			2.40
Outstanding, end of period			502,590				11.30				827,076				6.69
Options exercisable, end of period			298,343			$	7.08				581,433			$	4.58

		Six months ended June 30 , 2016								Six months ended June 30 , 2015
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share
Outstanding, beginning of period			513,366			$	9.24				976,062			$	6.23
Granted			63,000				21.21				45,000				19.41
Exercised			(63,537	)			3.72				(187,653	)			2.92
Forfeited			(9,489	)			17.23				(4,458	)			12.46
Expired			(750	)			3.76				(1,875	)			2.40
Outstanding, end of period			502,590				11.30				827,076				6.69
Options exercisable, end of period			298,343			$	7.08				581,433			$	4.58

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				Weighted average remaining contractual life (years)				Aggregate intrinsic value
$2.80	-	4.48				90,513			$	2.97				1.3			$	1,936,426				90,513			$	2.97				1.3			$	1,936,426
$5.52	-	8.92				178,177				6.63				2.9				3,158,294				154,755				6.51				2.8				2,761,971
$10.16	-	14.67				29,375				10.83				4.2				397,394				10,625				12.02				3.9				131,144
$15.51	-	19.95				132,775				17.35				5.1				930,368				42,450				16.67				4.4				326,578
$21.10	-	24.96				71,750				22.36				5.9				154,620				-				-				-				-
						502,590			$	11.30				3.7			$	6,577,102				298,343			$	7.08				2.6			$	5,156,119

X

- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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)
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