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Note 6 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Apr. 02, 2025
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Amended Warrants Reclassified to Stockholders' Equity $ 7,766,000     $ 7,766,000 $ 0  
Fair Value Adjustment of Warrants   $ (726,000) $ (0) (8,506,000) $ (0)  
Estimate of Fair Value Measurement [Member]            
Derivative Liability   $ 128,000   $ 128,000   $ 16,400,000