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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, 2024	Jun. 30, 2023
Anti-dilutive securities (in shares)	[1]	246,746	440,796
Series B Preferred Stock [Member]
Anti-dilutive securities (in shares)	[1]	15,065	201,432
Series C Preferred Stock [Member]
Anti-dilutive securities (in shares)	[1]	0	24,134
Share-Based Payment Arrangement, Option [Member]
Anti-dilutive securities (in shares)	[1]	6,904	4,301
Warrant [Member]
Anti-dilutive securities (in shares)	[1]	224,777	210,929
[1] After giving retroactive effect to a 1-for-35 reverse stock split that became effective May 30, 2024.

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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