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Note 8 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

						Weighted-
						Average
		Stock Options				Exercise Price
Options outstanding at December 31, 2019			276,266			$	72.38
Granted			60,065				105.79
Exercised			(18,052	)			49.68
Forfeited			(36,841	)			66.97
Options outstanding at June 30, 2020			281,438			$	81.67
Exercisable at June 30, 2020			144,822			$	65.88

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

		Six Months Ended June 30,
		2020		2019
Risk-free interest rate		0.50 - 1.47%		2.35 - 2.58%
Expected life (years)		6.25		6.25
Expected volatility		42.40 - 43.83%		42.52 - 42.74%
Expected dividend yield		0%		0%

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

						Weighted-
						Average
						Grant Date
		Restricted				Fair Value
		Stock				Per Share
Restricted stock at December 31, 2019			314,973			$	89.55
Granted			107,988				111.72
Restrictions lapsed			(100,596	)			84.57
Forfeited			(9,253	)			91.25
Restricted stock at June 30, 2020			313,112			$	98.75

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, 2019			9,383			$	58.35
Granted			19,956				118.66
Restrictions lapsed			(7,113	)			58.35
Performance change			-				-
Forfeited			(2,270	)			58.35
Performance stock at June 30, 2020			19,956			$	118.66

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

		Six Months Ended June 30,
		2020
Risk-free interest rate		1.41%
Expected life (years)		2.88
Expected volatility		38.70%
Expected dividend yield		0%

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

		Six Months Ended June 30,
		2020		2019
Risk-free interest rate		0.17 - 1.59%		2.33 - 2.35%
Expected life (months)		6.00		6.00
Expected volatility		42.63 - 59.99%		37.36 - 53.57%
Expected dividend yield		0%		0%

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