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Note 17 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

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 - December 31, 2017			1,753,275			$	36.03
Granted			470,000				67.32
Exercised			(278,975	)			26.60
Forfeited			(46,875	)			39.66
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				3.2			$	38,054
Options exercisable - End of year			645,975			$	47.48				2.0			$	19,695

Stock Options Exercised [Table Text Block]

		2019				2018
Number of options exercised			632,075				278,975
Aggregate fair value		$	43,873			$	17,823
Intrinsic value			21,934				10,403
Amount of cash received			21,939				7,420
Tax benefit recognized		$	1,322			$	73

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

		2019				2018
Risk free rate			2.1	%			2.2	%
Expected life in years			4.75				4.75
Expected volatility			28.8	%			29.7	%
Dividend yield			0.1	%			0.1	%
Weighted average fair value per option granted		$	19.87			$	19.41

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