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Note 7 - Stock Options and Other Compensation (Details Textual)
6 Months Ended
Jun. 30, 2024
$ / shares
shares
Jun. 30, 2023
shares
May 31, 1989
Number Of Key Executive Officer To Whom Non Statutory Stock Option Granted     4
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number | shares 767,500 767,500  
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit $ 1    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share) $ 1.25