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Note 7 - Net Loss Per Share - Schedule of Earning Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Net loss $ (2,119,000) $ (983,000) $ (1,136,000) $ (1,049,000) $ (1,219,000) $ (2,119,000) $ (2,268,000)
Preferred stock dividends   20,000   149,000   64,000 149,000
Induced conversion of warrants   0   751,000   0 751,000
Warrant modification   0   0   0 25,000
Net loss attributable to common share holders   $ (1,003,000)   $ (1,949,000)   $ (2,183,000) $ (3,193,000)
Basic and diluted (in shares)   22,882   2,487   20,003 2,277
Basic and diluted net loss per share (in dollars per share)   $ (0.04)   $ (0.78)   $ (0.11) $ (1.4)