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Note 7 - Net Loss Per Share - Schedule of Earning Per Share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Net loss $ (1,040,000) $ (983,000) $ (1,136,000) $ (895,000) $ (1,049,000) $ (1,219,000) $ (3,159,000) $ (3,163,000)
Preferred stock dividends 12,000     133,000     76,000 282,000
Warrants, deemed dividend 8,974,000     0     8,974,000 0
Induced conversion of warrants 0     0     0 751,000
Warrant modification 0     0     0 25,000
Net loss attributable to common stockholders $ (10,026,000)     $ (1,028,000)     $ (12,209,000) $ (4,221,000)
Basic and diluted (in shares) 890,943     243,378     735,286 230,214
Basic and diluted net loss per share (in dollars per share) $ (11.25)     $ (4.22)     $ (16.6) $ (18.34)