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Note 15 - 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
		Number of				average				contractual life				Aggregate
		options				exercise price				(years)				intrinsic value
Shares issuable under options - Beginning of period			1,639,100			$	60.26
Granted			542,000				114.90
Exercised			(294,238	)			40.34
Forfeited			(3,750	)			54.88
Shares issuable under options - December 31, 2020			1,883,112			$	79.11				2.6			$	108,772
Options exercisable - End of period			714,014			$	60.63				1.6			$	54,383

Stock Options Exercised [Table Text Block]

		2020
Number of options exercised			294,238
Aggregate fair value		$	33,734
Intrinsic value			22,224
Amount of cash received			11,510

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

		2020
Risk free rate			1.3	%
Expected life in years			4.75
Expected volatility			30.5	%
Dividend yield			0.5	%
Weighted average fair value per option granted		$	29.56

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