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Note 5 - Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Capital Reserved for Future Issuance [Table Text Block]

Stock options outstanding under 2019 Equity Incentive Plan			838,706
Restricted stock units outstanding under 2019 Equity Incentive Plan			339,505
Performance stock units outstanding under 2019 Equity Incentive Plan, at target			424,393
Shares authorized for future issuance under 2019 Equity Incentive Plan			3,134,739
Shares authorized for future issuance under 2019 Employee Stock Purchase Plan			1,130,770
Total			5,868,113

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

		Three Months Ended September 30,								Nine Months Ended September 30,
		2023				2022				2023				2022
		(in thousands)								(in thousands)
Stock-Based Compensation		$	3,589			$	3,092			$	10,737			$	8,556

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

		Number of shares				Weighted-average exercise price				Weighted-average remaining contractual term (in years)				Aggregate intrinsic value (in thousands)
Outstanding at January 1, 2023			882,892			$	33.85				—			$	—
Options granted			—				—
Options exercised			(32,882	)			17.61
Options canceled			(11,304	)			66.08
Outstanding at September 30, 2023			838,706			$	34.05				6.0			$	19,368
Vested and Exercisable at September 30, 2023			753,678			$	30.74				5.8			$	19,308

Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]

		Number of shares				Weighted-average grant date fair value
Outstanding at January 1, 2023			271,951			$	68.90
Granted			157,972				51.34
Released			(72,357	)			66.37
Forfeited			(18,061	)			52.27
Non-vested outstanding at September 30, 2023			339,505			$	62.15

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

		Number of shares				Weighted-average grant date fair value
Outstanding at January 1, 2023			383,103			$	37.62
Granted			46,029				51.36
Vested			—				—
Forfeited			(4,739	)			54.30
Non-vested outstanding at September 30, 2023			424,393			$	38.93

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