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Note 15 - Share Plans (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

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

		201 7				201 6				201 5
Weighted average grant date fair value		$	16.84			$	13.77			$	19.07
Assumptions:
Expected stock price volatility			40	%			41	%			41	%
Risk free interest rate			1.92	%			1.31	%			1.72	%
Expected annual dividend per share		$	-			$	-			$	-
Expected life of options (years)			6.25				6.25				6.25

Share-based Compensation, Stock Options, Activity [Table Text Block]

		Number of Option s				Weighted- Average Exercise Pric e				Weighted- Average Remaining Contractual Term (in years )				Aggregate Intrinsic Value ($ in thousands )
Outstanding as of December 31, 201 4			2,542,139			$	9.94				8.5			$	96,518
Grante d			287,165				45.18
Exercise d			(604,088	)			3.79
Expire d			(6,409	)			50.11
Forfeite d			(90,793	)			37.27
Outstanding as of December 31, 201 5			2,128,014				15.15				7.7			$	40,271
Grante d			398,313				33.24
Exercise d			(995,469	)			2.89
Forfeite d			(47,894	)			37.41
Outstanding as of December 31, 201 6			1,482,964				27.49				7.5			$	23,840
Grante d			346,421				40.13
Exercise d			(287,375	)			10.58
Forfeite d			(69,880	)			41.12
Outstanding as of December 31, 201 7			1,472,130				33.11				7.3			$	25,281
Exercisable as of December 31, 201 7			720,730				26.76				6.1			$	17,239

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

		Share s				Weighted- Average Grant- Date Fair Valu e
Non-vested as of December 31, 201 4			267,284			$	38.72
Grante d			193,117				41.31
Veste d			(183,362	)			32.56
Forfeite d			(33,999	)			47.77
Non-vested as of December 31, 201 5			243,040				44.16
Grante d			232,295				33.56
Veste d			(95,858	)			41.93
Forfeite d			(18,074	)			38.30
Non-vested as of December 31, 201 6			361,403				38.18
Grante d			211,769				39.91
Veste d			(133,796	)			40.60
Forfeite d			(47,100	)			42.48
Non-vested as of December 31, 201 7			392,276				37.77

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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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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