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Note 15 - Share-based Payments (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

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

		Three Months Ended June 30, 2021								Three Months Ended June 30, 2020
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share
Outstanding, beginning of period			808,469			$	55.55				730,037			$	50.85
Granted			239,050				79.43				190,025				59.53
Exercised			(45,538	)			43.24				(16,922	)			9.79
Forfeited			(9,498	)			61.23				(4,826	)			59.15
Expired			(1,386	)			61.93				(1,036	)			58.39
Outstanding, end of period			991,097				61.81				897,278				53.41
Options exercisable, end of period			438,437			$	53.16				390,868			$	46.20

		Six Months Ended June 30, 2021								Six Months Ended June 30, 2020
		Number of shares				Weighted average exercise price per share				Number of shares				Weighted average exercise price per share
Outstanding, beginning of period			845,020			$	55.31				754,497			$	49.94
Granted			239,050				79.43				195,525				59.19
Exercised			(73,875	)			44.82				(41,935	)			16.23
Forfeited			(17,562	)			61.00				(8,315	)			60.23
Expired			(1,536	)			61.93				(2,494	)			59.86
Outstanding, end of period			991,097				61.81				897,278				53.41
Options exercisable, end of period			438,437			$	53.16				390,868			$	46.20

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
15.93 - 19.95			29,239			$	18.98				0.7			$	1,793				29,239			$	18.98				0.7			$	1,793
21.10 - 27.53			32,500				23.33				1.0				1,852				32,500				23.33				1.0				1,852
35.25 - 37.35			4,375				37.35				0.5				188				4,375				37.35				0.5				188
46.90 - 48.00			13,000				47.36				4.6				428				7,000				47.29				3.6				231
51.82 - 59.98			274,858				55.56				3.0				6,806				204,102				55.56				2.9				5,054
60.01 - 68.41			378,525				62.07				5.1				6,908				151,221				62.39				4.8				2,712
72.50 - 79.87			258,600				78.89				6.8				369				10,000				72.50				6.4				78
			991,097			$	61.81				4.7			$	18,344				438,437			$	53.16				3.3			$	11,908

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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-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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