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Note 9 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]

		Shares Available for Grant				Number of Shares Outstanding				Weighted-Average Exercise Price
Balance as of December 31, 2021			42				3,763			$	2.29
Authorized			1,338				-				-
Options Granted			(1,307	)			1,307				10.97
RSAs Granted			(89	)			-				-
Exercised			-				(295	)			0.93
Forfeited/expired			81				(81	)			11.63
Balance as of December 31, 2022			65				4,694			$	4.63
Authorized			1,644				-				-
Options Granted			(1,278	)			1,278				3.60
RSAs Granted			(244	)			-				-
Exercised			-				(177	)			1.83
Forfeited/expired			269				(269	)			5.93
Balance as of December 31, 2023			456				5,526			$	4.42

Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]

		Number of Shares				Weighted Average Exercise Price				Remaining Contractual Term (In Years)				Aggregate Intrinsic Value1
2023
Vested and Exercisable			3,986			$	3.58				6.47			$	11,695
Unvested			1,540				6.55				8.67				1,621
Total			5,526			$	4.42				7.04			$	13,316
2022
Vested and Exercisable			3,170			$	2.46				6.98			$	7,419
Unvested			1,524				9.13				8.81				647
Total			4,694			$	4.63				7.58			$	8,066

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

Description		For the year ended December 31,
		2023				2022
Dividend-yield			0	%			0	%
Risk-free interest rate			3.86	%			2.03	%
Expected volatility			124.62	%			117.21	%
Expected life (years)			7.00				7.00
Market value per share on grant date		$	3.60			$	10.97
Fair value per share on grant date		$	3.29			$	9.71

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Tabular disclosure of share-based payment arrangement.

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-Name Accounting Standards Codification
-Section 50
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-SubTopic 10
-Topic 718
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