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Note 15 - Share-based Payments (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

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

		Three Months Ended March 31, 2021								Three Months Ended March 31, 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			-				-				5,500				47.35
Exercised			(28,337	)			47.03				(25,013	)			20.59
Forfeited			(8,064	)			60.72				(3,489	)			61.73
Expired			-				-				(1,458	)			60.91
Outstanding, end of period			808,619				55.55				730,037				50.85
Options exercisable, end of period			378,258			$	49.35				349,845			$	41.65

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			42,064			$	18.05				0.8			$	2,501				42,064			$	18.05				0.8			$	2,501
$21.10 - $27.53			36,250				23.76				1.2				1,948				36,250				23.76				1.2				1,948
$35.25 - $37.35			5,625				36.88				1.2				228				5,625				36.88				1.2				228
$46.90 - $48.00			13,000				47.36				4.8				392				6,000				47.17				3.5				182
$51.82 - $59.98			291,372				55.52				3.2				6,405				217,616				55.50				3.1				4,787
$60.01 - $68.41			400,308				62.07				5.3				6,177				70,703				63.32				4.6				1,002
$72.50 - $72.50			20,000				72.50				6.7				100				-				-				-				-
			808,619			$	55.55				4.1			$	17,751				378,258			$	49.35				2.9			$	10,648

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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