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Note 7 - Shareholders' Equity (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares) 437,546 247,961
Stock Issued During Period, Shares, New Issues (in shares) 30,569  
Treasury Stock, Common, Shares (in shares) 12,253,502 12,253,502
Treasury Stock, Value $ 18,929,915 $ 18,929,915
Restricted Stock Units (RSUs) [Member]    
Shares Issued, Price Per Share (in dollars per share) $ 1.52 $ 1.38
Share-Based Payment Arrangement, Option [Member]    
Shares Issued, Price Per Share (in dollars per share) $ 1.04  
Convertible Notes Converted into Common Stock [Member]    
Stock Issued During Period, Shares, Conversion of Convertible Securities (in shares) 556,623  
Shares Issued, Price Per Share (in dollars per share) $ 1.63