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Note 15 - Share-based Payments (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

		Three months ended March 31, 2019								Three months ended March 31, 2018
		Number of Shares				Weighted average exercise price per share				Number of Shares				Weighted average exercise price per share
Outstanding, beginning of period		$	702,337			$	43.80			$	653,571			$	36.69
Granted			-				-				11,000				58.52
Exercised			(29,043	)			24.63				(12,563	)			7.79
Forfeited			(6,751	)			59.40				(17,125	)			42.54
Expired			(1,387	)			60.82				-				-
Outstanding, end of period		$	665,156			$	44.46			$	634,883			$	37.48
Options exercisable, end of period		$	304,007			$	29.52			$	245,933			$	16.62

Share-based Payment Arrangement, Option, 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 outstanding				Weighted average exercise price per share				Weighted average remaining contractual life (years)				Aggregate intrinsic value
$5.52	-	$8.56			48,633			$	6.96				0.7			$	3,610				48,633			$	6.96				0.7			$	3,610
$10.16	-	$19.95			91,438				16.30				2.2				5,933				90,188				16.25				2.2				5,856
$21.10	-	$27.53			61,250				23.62				2.9				3,526				51,250				24.11				2.7				2,925
$35.25	-	$37.35			14,375				35.89				4.2				651				11,875				36.02				4.0				536
$43.15	-	$47.00			18,500				44.19				4.8				684				11,500				43.99				4.8				428
$53.20	-	$58.65			315,608				55.67				5.1				8,052				90,561				55.21				4.8				2,351
$64.10	-	$64.10			115,352				64.10				6.2				1,970				-				-				-				-
					665,156			$	44.46				4.4			$	24,426				304,007			$	29.52				3.0			$	15,706