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Note 10 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

										Weighted
										Average
		Awards				Options				Exercise
		Available				Outstanding				Price
Balance December 31, 2021			3,651				28,685			$	7.90
Restricted stock unit awards granted			(391	)			—				—
Restricted stock unit awards cancelled			40				—				—
Stock option awards granted			(109	)			109				16.49
Stock option awards exercised			—				(1,033	)			5.83
Stock option awards cancelled			369				(369	)			11.22
Balance March 31, 2022			3,560				27,392			$	7.96

										Weighted
										Average
		Awards				Options				Exercise
		Available				Outstanding				Price
Balance December 31, 2021			900				4,408			$	6.20
Restricted stock unit awards granted			(134	)			—				—
Stock option awards granted			(566	)			566				16.10
Stock option awards exercised			—				(51	)			3.22
Stock option awards cancelled			58				(58	)			6.29
Balance March 31, 2022			258				4,865			$	7.42

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

			2022			2021
Expected Life in Years			5.5				5.5
Expected Volatility			84.1	%			84.2	%
Expected Dividend Yield			0.0	%			0.0	%
Risk-Free Interest Rate			1.9	%			0.8	%

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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X

- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

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