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Note 9 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Notes Tables

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

						Weighted-
						Average
		Stock Options				Exercise Price
Options outstanding at December 31, 2017			399,397			$	51.14
Granted			34,386				109.91
Exercised			(108,941	)			37.04
Forfeited			(17,077	)			61.30
Options outstanding at June 30, 2018			307,765			$	62.14
Exercisable at June 30, 2018			168,243			$	49.52

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

		Six Months Ended June 30,
		2018					2017
Risk-free interest rate		2.52	-	3.07%			2.24%
Expected life (years)		6.25					6.50
Expected volatility		41.95	-	42.22%			44.68%
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, 2017			334,608			$	63.29
Granted			103,818				115.20
Restrictions lapsed			(83,390	)			62.84
Forfeited			(21,969	)			62.28
Restricted stock at June 30, 2018			333,067			$	79.64

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, 2017			25,707			$	58.35
Granted			20,006				105.75
Restrictions lapsed			-				-
Performance change			6,427				58.35
Forfeited			-				-
Performance stock at June 30, 2018			52,140			$	76.54

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

		Six Months Ended June 30,
		2018					2017
Risk-free interest rate		1.48	-	2.06%			0.59%	-	0.97%
Expected life (months)		6.00					6.00
Expected volatility		24.49	-	31.50%			34.51%	-	39.51%
Expected dividend yield		0%					0%

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

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