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Note 7 - Shareholders' Equity (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares)         335,195    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)         30,000    
Treasury Stock, Common, Shares (in shares) 12,253,502       12,253,502   12,253,502
Treasury Stock, Value $ 18,929,915       $ 18,929,915   $ 18,929,915
Common Stock [Member]              
Stock Issued During Period, Shares, New Issues (in shares)         778,310    
Share-based Compensation Arrangements by Share-based Payment Award, Other than Options, Grants in Period, Weighted Average Exercise Price (in dollars per share) $ 1.63       $ 1.63 $ 1.38  
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares) 111,732 223,463          
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares)   61,793 375,753 247,961 437,546 247,961  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)   5,569     5,569