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Note 15 - Share-based Payments (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

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

		Three Months Ended September 30, 2020								Three Months Ended September 30, 2019
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share
Outstanding, beginning of period			897,278			$	53.41				774,915			$	48.63
Granted			23,800				68.30				36,500				54.51
Exercised			(38,102	)			38.58				(12,260	)			15.60
Forfeited			(10,678	)			60.54				(7,014	)			60.87
Expired			(636	)			58.77				(12,875	)			44.98
Outstanding, end of period			871,662				54.38				779,266				49.37
Options exercisable, end of period			436,862			$	48.57				368,664			$	39.43

		Nine Months Ended September 30, 2020								Nine Months Ended September 30, 2019
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share
Outstanding, beginning of period			754,497			$	49.94				702,337			$	43.80
Granted			219,325				60.18				180,800				60.56
Exercised			(80,037	)			26.87				(66,619	)			18.65
Forfeited			(18,993	)			60.41				(22,315	)			58.59
Expired			(3,130	)			59.64				(14,937	)			46.45
Outstanding, end of period			871,662				54.38				779,266				49.37
Options exercisable, end of period			436,862			$	48.57				368,664			$	39.43

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 exercisable				Weighted average exercise price per share				Weighted average remaining contractual life (years)				Aggregate intrinsic value
$10.16 - $19.95			61,514			$	16.21				1.0			$	3,241				61,514			$	16.21				1.0			$	3,241
$21.10 - $27.53			36,250				23.76				1.7				1,636				36,250				23.76				1.7				1,636
$35.25 - $37.35			5,625				36.88				1.7				180				4,375				37.35				1.3				138
$46.90 - $48.00			14,000				47.33				5.4				302				3,750				47.00				3.4				82
$51.82 - $59.98			329,046				55.52				3.8				4,402				248,490				55.52				3.6				3,325
$60.01 - $68.41			425,227				62.08				5.8				2,899				82,483				63.33				5.1				459
			871,662			$	54.38				4.5			$	12,660				436,862			$	48.57				3.3			$	8,881

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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- Definition

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