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Note 2 - Summary of Significant Accounting Policies - Outstanding Stock Warrants Excluded from the Diluted Net Loss Per Share Computation (Details) - shares
shares in Thousands
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Anti-dilutive securities (in shares) 4,345 247
Series B Preferred Stock [Member]    
Anti-dilutive securities (in shares) 15 15
Share-Based Payment Arrangement, Option [Member]    
Anti-dilutive securities (in shares) 1 7
Warrant [Member]    
Anti-dilutive securities (in shares) 4,329 225