Note 21 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

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, 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
Granted		837,500			95.69
Exercised		(305,125	)		54.99
Forfeited		(30,250	)		110.73
Shares issuable under options - December 31, 2022		3,053,000		$	94.30		3.1	$	25,723
Options exercisable - December 31, 2022		1,271,220		$	83.31		2.1	$	18,801

Stock Options Exercised [Table Text Block]

	Year ended December 31,
	2022		2021
Number of options exercised		305,125		292,450
Aggregate fair value	$	41,528	$	32,808
Intrinsic value		16,779		14,440
Amount of cash received		24,749		18,368
Tax benefit recognized	$	754	$	937

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

	As at December 31,
	2022			2021
Risk free rate		4.2	%		0.8	%
Expected life in years		4.75			4.75
Expected volatility		41.2	%		39.4	%
Dividend yield		0.3	%		0.2	%
Weighted average fair value per option granted	$	38.22		$	46.12