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Note 14 - Share-based Payments (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

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

		Three months ended March 31,								Three months ended March 31,
		2018								2017
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share
Outstanding, beginning of period			653,571			$	36.69				474,501			$	12.67
Granted			11,000				58.52				32,875				40.56
Exercised			(12,563	)			7.79				(68,876	)			7.83
Forfeited			(17,125	)			42.54				(7,889	)			18.46
Expired			-				-				-				-
Outstanding, end of period			634,883				37.48				430,611				15.46
Options exercisable, end of period			245,933			$	16.62				264,753			$	10.72

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
$ 2.92	-	$ 8.92			81,695			$	6.81				0.7			$	4,018,538				81,695			$	6.81				0.7			$	4,018,538
$10.16	-	$19.95			117,013				16.31				2.5				4,644,246				90,613				15.93				2.3				3,631,248
$21.10	-	$27.53			75,000				23.67				3.1				2,424,562				55,000				24.61				2.8				1,726,562
$35.25	-	$37.35			14,375				35.89				4.4				289,094				10,625				36.11				4.2				211,281
$43.15	-	$47.00			18,500				44.19				5.1				218,475				8,000				43.75				5.1				97,988
$53.20	-	$58.65			328,300				55.51				5.4				188,055				-				-				-				-
					634,883			$	37.48				4.0			$	11,782,970				245,933			$	16.62				2.0			$	9,685,617

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

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