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Note 20 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

										Weighted average
						Weighted				remaining				Aggregate
		Number of				average				contractual life				intrinsic
		options				exercise price				(years)				value
Shares issuable under options - December 31, 2019			2,001,600			$	58.96
Granted			547,250				85.79
Exercised			(344,225	)			35.86
Forfeited			(14,500	)			70.07
Shares issuable under options - December 31, 2020			2,190,125			$	69.22
Granted			682,500				136.38
Exercised			(292,450	)			49.38
Forfeited			(29,300	)			80.15
Shares issuable under options - December 31, 2021			2,550,875			$	89.34				3.1			$	147,597
Options exercisable - December 31,2021			978,188			$	72.14				2.1			$	73,420

Stock Options Exercised [Table Text Block]

		Year ended December 31,
		2021				2020
Number of options exercised			292,450				344,225
Aggregate fair value		$	32,808			$	25,919
Intrinsic value			14,440				13,576
Amount of cash received			18,367				12,343
Tax benefit recognized		$	937			$	102

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		As at December 31,
		2021				2020
Risk free rate			0.8	%			0.2	%
Expected life in years			4.75				4.41
Expected volatility			39.4	%			36.5	%
Dividend yield			0.2	%			0.1	%
Weighted average fair value per option granted		$	46.12			$	28.33

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