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Note 8 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

		Number of options and SAR units (1)				Weighted average exercise price				Weighted average remaining contractual term				Aggregate intrinsic-value
Outstanding at the beginning of the year			729,017			$	19.77				5.2			$	19,229
Granted			—				—
Exercised			(22,530	)			16.07
Forfeited or expired			(3,670	)			22.67
Outstanding at the end of the year (2)			702,817			$	19.88				4.3			$	2,708
Exercisable at the end of the year (3)			623,718			$	19.14				4.0			$	2,648

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

					Outstanding												Exercisable
Exercise price (range)					Number of options and SAR s				Weighted average remaining contractual life (years)				Weighted average exercise price				Number of options and SARs				Weighted average remaining contractual life (years)				Weighted average exercise price
14.16	-	18.62				346,863				3.2			$	15.68				344,527				3.2			$	15.66
19.36	-	19.83				182,995				5.0			$	19.44				163,050				4.9			$	19.43
24.86	-	30.60				172,959				5.7			$	28.75				116,141				4.9			$	29.06
						702,817				4.3			$	19.88				623,718				4.0			$	19.14

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

		Number of RSUs				Weighted average Grant-Date fair value
Unvested as at the beginning of the year			560,616			$	29.31
Granted			328,896				34.14
Vested			(280,890	)			28.09
Forfeited			(44,232	)			35.12
Unvested at the end of the year			564,390			$	32.28

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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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