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Note 6 - Stock Based Compensation - Summary of Stock Based Compensation Activity (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Options outstanding, number of options (in shares) 10,000 16,668
Options outstanding, Weighted Average Exercise Price (in dollars per share) $ 48.75 $ 143.62
Options exercisable, number of options (in shares) 6,668 10,000
Options exercisable, Weighted Average Exercise Price (in dollars per share) $ 48.75 $ 239.38
Vested, outstanding, number of options (in shares) 0 0
Vested, outstanding, , Weighted Average Exercise Price (in dollars per share)   $ 0
Vested exercisable, number of options (in shares) 3,332 3,336
Vested exercisable, Weighted Average Exercise Price (in dollars per share) $ 48.75 $ 48.75
Expired, outstanding, number of options (in shares)   (6,668)
Expired, outstanding, Weighted Average Exercise Price (in dollars per share)   $ 285.89
Expired exercisable, number of options (in shares)   (6,668)
Expired exercisable, Weighted Average Exercise Price (in dollars per share)   $ 285.89
Options outstanding, number of options (in shares) 10,000 10,000
Options outstanding, Weighted Average Exercise Price (in dollars per share) $ 48.75 $ 48.75
Options exercisable, number of options (in shares) 10,000 6,668
Options exercisable, Weighted Average Exercise Price (in dollars per share) $ 48.75 $ 48.75