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Note 5 - Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2025

Equity [Abstract]

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

Common stock reserved for future issuance consists of the following as of September 30, 2025:

Stock options outstanding under 2019 Equity Incentive Plan			508,875
Restricted stock units outstanding under 2019 Equity Incentive Plan			302,720
Performance stock units outstanding under 2019 Equity Incentive Plan, at target			502,246
Shares authorized for future issuance under 2019 Equity Incentive Plan			4,221,675
Shares authorized for future issuance under 2019 Employee Stock Purchase Plan			1,581,244
Total			7,116,760

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

The below table summarizes the Company’s stock-based compensation expense for each period presented:

		Three Months Ended September 30,								Nine Months Ended September 30,
		2025				2024				2025				2024
		(in thousands)								(in thousands)
Stock-based compensation		$	5,379			$	4,117			$	15,471			$	11,905

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

The following table summarizes stock option transactions for the nine months ended September 30, 2025:

		Number of shares				Weighted-average exercise price				Weighted-average remaining contractual term (in years)				Aggregate intrinsic value (in thousands)
Outstanding at January 1, 2025			588,385			$	33.76				4.9			$	42,273
Options granted			—				—
Options exercised			(78,976	)			42.36
Options cancelled			(534	)			83.46
Outstanding at September 30, 2025			508,875			$	32.37				4.1			$	53,284
Vested and Exercisable at September 30, 2025			508,807			$	32.37				4.1			$	53,279

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

The following table summarizes RSU transactions for the nine months ended September 30, 2025:

		Number of shares				Weighted-average grant date fair value
Outstanding at January 1, 2025			320,411			$	65.03
Granted			130,320				115.65
Released			(140,737	)			62.68
Forfeited			(7,274	)			85.58
Non-vested outstanding at September 30, 2025			302,720			$	87.42

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

The following table summarizes PSU transactions for the nine months ended September 30, 2025:

		Number of shares				Weighted-average grant date fair value
Outstanding at January 1, 2025			460,450			$	40.43
Granted			86,844				99.61
Vested			(41,400	)			50.35
Forfeited			(3,648	)			73.15
Non-vested outstanding at September 30, 2025			502,246			$	49.60

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