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Note 14 - Share-based Payments (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

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

		Three months ended September 30,								Three months ended September 30,
		2018								2017*
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share

Outstanding, beginning of period			734,196			$	42.39				363,608			$	16.79
Granted			23,800				57.78				327,150				55.49
Exercised			(15,782	)			8.00				(30,051	)			6.67
Forfeited			(8,635	)			59.20				(1,050	)			51.87
Expired			-				-				-				-
Outstanding, end of period			733,579				43.43				659,657				36.39
Options exercisable, end of period			326,887			$	29.00				223,043			$	14.30

		Nine months ended September 30,								Nine months ended September 30,
		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			163,366				62.80				360,025				54.13
Exercised			(44,498	)			9.49				(165,673	)			7.79
Forfeited			(38,860	)			50.46				(9,196	)			22.08
Expired			-				-				-				-
Outstanding, end of period			733,579				43.43				659,657				36.39
Options exercisable, end of period			326,887			$	29.00				223,043			$	14.30

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

$5.52	-	$8.56			60,573			$	6.89				1.2			$	2,960				60,573			$	6.89				1.2			$	2,960
$10.16	-	$19.95			108,063				16.39				2.7				4,254				95,563				15.98				2.6				3,801
$21.10	-	$27.53			72,500				23.76				3.3				2,319				52,500				24.78				3.0				1,626
$35.25	-	$37.35			14,375				35.89				4.7				286				10,625				36.11				4.4				209
$43.15	-	$47.00			18,500				44.19				5.3				214				8,000				43.75				5.3				96
$53.20	-	$58.65			337,275				55.67				5.6				108				99,626				55.21				5.4				68
$64.10	-	$64.10			122,293				64.10				6.7				-				-				-				-				-
					733,579			$	43.43				4.8			$	10,141				326,887			$	29.00				3.4			$	8,760