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Note 7 - Net Loss Per Share - Schedule of Earnings Per Share (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Net loss $ (2,290,000) $ (605,000) $ (672,000) $ (1,040,000) $ (983,000) $ (1,136,000) $ (3,567,000) $ (3,159,000)  
Less: preferred stock dividends 4,000     12,000     29,000 76,000  
Less: deemed dividend 0     8,974,000     0 8,974,000 $ 8,974,000
Net loss attributable to common stockholders $ (2,294,000)     $ (10,026,000)     $ (3,596,000) $ (12,209,000)  
Basic and diluted (in shares) 3,101,231     890,943     2,049,441 735,286  
Basic and diluted net loss per share (in dollars per share) $ (0.74)     $ (11.25)     $ (1.76) $ (16.6)