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Note 2 - Summary of Significant Accounting Policies - Outstanding Stock Options and Stock Warrants Excluded from the Diluted Net Loss Per Share Computation (Details) - shares shares in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Anti-dilutive securities (in shares)	15,392	2,231
Series B Preferred Stock [Member]
Anti-dilutive securities (in shares)	7,050	830
Series C Preferred Stock [Member]
Anti-dilutive securities (in shares)	845	0
Share-Based Payment Arrangement, Option [Member]
Anti-dilutive securities (in shares)	115	127
Warrant [Member]
Anti-dilutive securities (in shares)	7,382	1,274

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

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