Note 15 - Share-based Payments (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

	Three Months Ended Mar 31, 2020					Three Months Ended March 31, 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		5,500			47.35		-			-
Exercised		(25,013	)		20.59		(29,043	)		24.63
Forfeited		(3,489	)		61.73		(6,751	)		59.40
Expired		(1,458	)		60.91		(1,387	)		60.82
Outstanding, end of period		730,037			50.85		665,156			44.46
Options exercisable, end of period		349,845		$	41.65		304,007		$	29.52

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
$ 8.56 - $ 8.56		15,722	$	8.56		0.1	$	624		15,722	$	8.56		0.1	$	624
$10.16 - $19.95		62,990		16.23		1.5		2,018		62,990		16.23		1.5		2,018
$21.10 - $27.53		51,250		24.11		1.7		1,237		51,250		24.11		1.7		1,237
$35.25 - $37.35		14,375		35.89		3.2		178		13,125		35.95		3.1		162
$44.90 - $47.00		10,000		46.95		5.4		13		3,750		47.00		4.0		5
$51.82 - $58.65		337,353		55.53		4.2		-		176,527		55.69		4.0		-
$61.33 - $64.10		238,347		62.99		5.7		-		26,481		64.10		5.2		-
		730,037	$	50.85		4.2	$	4,070		349,845	$	41.65		3.1	$	4,046