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Note 8 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Notes Tables

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

						Weighted-
						Average
		Stock Options				Exercise Price
Options outstanding at December 31, 2016			569,639			$	45.00
Granted			43,095				58.35
Exercised			(136,483	)			34.82
Forfeited			(16,943	)			58.17
Options outstanding at September 30, 2017			459,308			$	48.79
Exercisable at September 30, 2017			270,705			$	40.54

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

		Nine Months Ended September 30,
		2017				2016
Risk-free interest rate			2.24%				1.53	-	1.68%
Expected life (years)			6.50					6.50
Expected volatility			44.68%				44.38	-	45.93%
Expected dividend yield			0%					0%

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

						Weighted-
						Average
						Grant Date
		Restricted				Fair Value
		Stock				Per Share
Restricted stock at December 31, 2016			215,105			$	62.78
Granted			197,649				61.60
Restrictions lapsed			(55,205	)			63.62
Forfeited			(13,074	)			63.51
Restricted stock at September 30, 2017			344,475			$	61.94

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

						Weighted-
						Average
						Grant Date
		Performance				Fair Value
		Stock				Per Share
Performance stock at December 31, 2016			-			$	-
Granted			25,707				58.35
Restrictions lapsed			-				-
Forfeited			-				-
Performance stock at September 30, 2017			25,707			$	58.35

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

		Nine Months Ended September 30,
		2017						2016
Risk-free interest rate			0.59%	-	0.97%				0.39	-	0.56%
Expected life (months)				6.00						6.00
Expected volatility			34.51%	-	39.51%				29.41	-	49.13%
Expected dividend yield				0%						0%

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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