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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
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Anti-dilutive securities (in shares) 34,323,344 4,642,803
Series B Preferred Stock [Member]    
Anti-dilutive securities (in shares) 22,428,000 1,847,580
Series C Preferred Stock [Member]    
Anti-dilutive securities (in shares) 4,388,000 357,750
Share-Based Payment Arrangement, Option [Member]    
Anti-dilutive securities (in shares) 124,897 131,954
Warrant [Member]    
Anti-dilutive securities (in shares) 7,382,447 2,305,519