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Note 21 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

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, 2018			1,897,425			$	45.08
Granted			960,000				70.99
Exercised			(632,075	)			34.71
Forfeited			(223,750	)			61.41
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				3.2			$	43,606
Options exercisable - December 31,2020			747,975			$	60.51				2.3			$	21,407

Stock Options Exercised [Table Text Block]

		Year ended December 31,
			2020				2019
Number of options exercised			344,225				632,075
Aggregate fair value		$	25,919			$	43,873
Intrinsic value			13,576				21,934
Amount of cash received			12,343				21,939
Tax benefit recognized		$	102			$	1,322

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

		As at December 31,
			2020				2019
Risk free rate			0.2	%			2.1	%
Expected life in years			4.41				4.75
Expected volatility			36.5	%			28.8	%
Dividend yield			0.1	%			0.1	%
Weighted average fair value per option granted		$	28.33			$	19.87

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