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Note 7 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

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

										Weighted
										Average
		Awards				Options				Exercise
		Available				Outstanding				Price
Balance December 31, 2020			4,592				24,885			$	6.52
Plan amendment			7,500				-				-
Restricted stock unit awards granted			(100	)			-				-
Stock option awards granted			(2,108	)			2,108				11.87
Stock option awards exercised			-				(2,205	)			4.11
Stock option awards cancelled			208				(208	)			7.47
Balance September 30, 2021			10,092				24,580			$	7.18

										Weighted
										Average
		Awards				Options				Exercise
		Available				Outstanding				Price
Balance December 31, 2020			229				4,171			$	3.88
Plan amendment			1,500				-				-
Stock option awards granted			(738	)			738				14.23
Stock option awards exercised			-				(386	)			3.61
Stock option awards cancelled			122				(122	)			3.86
Balance September 30, 2021			1,113				4,401			$	5.64

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

		2021				2020
Expected Life in Years			5.5				5.5
Expected Volatility			84.2	%			83.8	%
Expected Dividend Yield			0.0	%			0.0	%
Risk-Free Interest Rate			0.8	%			0.4	%

X

- Definition

Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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