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Note 10 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 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			118,434				48.24
Exercised			(3,114	)			30.58
Forfeited			(38,618	)			91.27
Expired			(34,201	)			89.71
Options outstanding at September 30, 2022			275,885			$	79.19
Exercisable at September 30, 2022			108,659			$	91.50

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

		Nine Months Ended September 30,
		2022				2021
Risk-free interest rate			1.94% - 3.40%				0.80% - 1.12%
Expected life (years)			6.25				6.25
Expected volatility			45.95% - 46.03%				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			312,270				42.05
Restrictions lapsed			(120,606	)			104.99
Forfeited			(39,480	)			106.64
Restricted stock at September 30, 2022			495,966			$	69.95

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			35,697				96.71
Restrictions lapsed			-				-
Performance change			-				-
Forfeited			(3,578	)			121.79
Performance stock at September 30, 2022			48,958			$	109.80

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

		Nine Months Ended September 30,
		2022				2021
Risk-free interest rate			1.76% - 3.40%				0.22%
Expected life (years)			2.34 - 2.87				2.87
Expected volatility			53.5% - 53.6%				51.40%
Expected dividend yield			0%				0%

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

		Nine Months Ended September 30,
		2022				2021
Risk-free interest rate			0.17 - 2.06%				0.06 - 0.12%
Expected life (months)			6.00				6.00
Expected volatility			47.05 - 53.44%				50.85 - 65.53%
Expected dividend yield			0%				0%

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