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Note 4 - Basic and Diluted Net Income (Loss) Per Share - Schedule of Dilutive Securities (Details) - $ / shares shares in Thousands | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Total Number of Potentially Dilutive Shares Excluded from the basic and diluted net loss per share calculation (in shares) | 8,879 | 4,540
Debt with Conversion Feature [Member] |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ 30 | $ 30
Total Number of Potentially Dilutive Shares Excluded from the basic and diluted net loss per share calculation (in shares) | 1,151 | 1,259
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) | 7,728 | 3,281

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