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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
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Anti-dilutive securities (in shares) 17,308,108 4,632,052
Series B Preferred Stock [Member]    
Anti-dilutive securities (in shares) 3,616,000 1,847,580
Series C Preferred Stock [Member]    
Anti-dilutive securities (in shares) 5,192,961 357,750
Share-Based Payment Arrangement, Option [Member]    
Anti-dilutive securities (in shares) 116,700 121,203
Warrant [Member]    
Anti-dilutive securities (in shares) 8,382,447 2,305,519