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Note 4 - Basic and Diluted Net Loss Per Share - Schedule of Dilutive Securities (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Total Number of Potentially Dilutive Shares Excluded from the basic and diluted net loss per share calculation (in shares)	9,013	7,498
Series B Convertible Preferred Stock [Member]
Total Number of Potentially Dilutive Shares Excluded from the basic and diluted net loss per share calculation (in shares)	0	127
Common Stock Options and Warrants [Member]
Total Number of Potentially Dilutive Shares Excluded from the basic and diluted net loss per share calculation (in shares)	7,743	6,125
Debt with Conversion Feature [Member]
Total Number of Potentially Dilutive Shares Excluded from the basic and diluted net loss per share calculation (in shares)	1,270	1,246

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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