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Note 17 - Share Plans (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

		Year Ended December 31,
		2021				2020				2019
Weighted average grant date fair value		$	129.47			$	35.79			$	19.33
Assumptions:
Expected stock price volatility			37	%			32	%			33	%
Risk free interest rate			0.45	%			1.56	%			2.52	%
Expected annual dividend per share		$	-			$	-			$	-
Expected life of options (years)			6.25				6.25				6.25

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

		Number of Options				Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Term (in years)				Aggregate Intrinsic Value ($ in thousands)
Outstanding as of December 31, 2018			1,521,167			$	37.70				7.0			$	19,212
Granted			369,779				52.07
Exercised			(263,250	)			30.75
Forfeited			(35,010	)			43.79
Outstanding as of December 31, 2019			1,592,686				42.04				6.9			$	93,242
Granted			173,650				102.32
Exercised			(216,196	)			39.88
Forfeited			(21,450	)			50.25
Outstanding as of December 31, 2020			1,528,690				49.08				6.3			$	272,553
Granted			70,392				335.70
Exercised			(229,921	)			45.95
Forfeited			(27,030	)			63.27
Outstanding as of December 31, 2021			1,342,131				64.29				5.5			$	386,069
Exercisable as of December 31, 2021			896,456				42.04				4.4			$	277,794

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

		Shares				Weighted-Average Grant-Date Fair Value
Non-vested as of December 31, 2018			425,996			$	40.50
Granted			265,255				62.38
Vested			(184,628	)			38.78
Forfeited			(14,986	)			44.23
Non-vested as of December 31, 2019			491,637				52.84
Granted			183,868				95.14
Vested			(200,390	)			45.10
Forfeited			(18,921	)			56.58
Non-vested as of December 31, 2020			456,194				68.42
Granted			126,339				223.09
Vested			(202,327	)			58.99
Forfeited			(14,241	)			138.64
Non-vested as of December 31, 2021			365,965				124.25

X

- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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