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Note 10 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

						Weighted-
						Average
		Stock Options				Exercise Price
Options outstanding at December 31, 2021			233,384			$	97.78
Granted			52,992				59.40
Exercised			(201	)			30.58
Forfeited			(21,287	)			86.55
Options outstanding at March 31, 2022			264,888			$	91.06
Exercisable at March 31, 2022			126,595			$	87.42

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

		Three Months Ended March 31,
		2022				2021
Risk-free interest rate			1.94%				0.80% - 0.96%
Expected life (years)			6.25				6.25
Expected volatility			45.95%				45.28 - 45.35%
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, 2021			343,782			$	111.79
Granted			44,782				59.40
Restrictions lapsed			(35,207	)			123.15
Forfeited			(11,068	)			109.73
Restricted stock at March 31, 2022			342,289			$	103.84

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, 2021			16,839			$	115.56
Granted			32,620				100.33
Restrictions lapsed			-				-
Performance change			-				-
Forfeited			-				-
Performance stock at March 31, 2022			49,459			$	105.52

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

		Three Months Ended March 31,
		2022				2021
Risk-free interest rate			1.76%				0.22%
Expected life (years)			2.87				2.87
Expected volatility			53.50%				51.40%
Expected dividend yield			0%				0%

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

		Three Months Ended March 31,
		2022				2021
Risk-free interest rate			0.17%				0.12%
Expected life (months)			6.00				6.00
Expected volatility			53.44%				50.85%
Expected dividend yield			0%				0%

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