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Note 17 - Share Plans (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

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

		Year Ended December 31,
		2022				2021				2020
Weighted average grant date fair value per share		$	129.38			$	129.47			$	35.79
Assumptions:
Expected stock price volatility			38	%			37	%			32	%
Risk free interest rate			1.54	%			0.45	%			1.56	%
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, 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
Granted			109,266				282.20
Exercised			(137,305	)			36.91
Forfeited			(45,688	)			194.05
Outstanding as of December 31, 2022			1,268,404				81.35				4.9			$	47,764
Exercisable as of December 31, 2022			982,934				50.86				4.1			$	44,904

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

		Shares				Weighted-Average Grant-Date Fair Value
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
Granted			287,821				214.58
Vested			(234,284	)			83.52
Forfeited			(41,204	)			263.47
Non-vested as of December 31, 2022			378,298				203.04

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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