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Note 9 - Net Loss Per Share - Anti-dilutive Securities (Details) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Stock options to purchase common stock (in shares)	4,595,908	4,046,556
Share-Based Payment Arrangement, Option [Member]
Stock options to purchase common stock (in shares)	2,168,450	1,616,364
Restricted Stock Units (RSUs) [Member]
Stock options to purchase common stock (in shares)	2,734	5,468
Warrant [Member]
Stock options to purchase common stock (in shares)	2,424,724	2,424,724

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482662/260-10-50-1

+ Details

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- Details

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- Details

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