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Note 9 - Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2024
Notes Tables  
Gain (Loss) on Securities [Table Text Block]
   

THREE MONTHS
ENDED
JUNE 30,

    

SIX MONTHS

ENDED
JUNE 30,

  
   

2024

    

 

2023

    

2024

    

2023

  

Net (losses) gains recognized during the period on marketable securities

   $ (9,501 )   $ 7,479     $ 31,995     $ 80,180  

Less: Net losses recognized on marketable securities sold during the period

     -       (433,769 )     -       (433,769 )

Unrealized (losses) gains recognized during the reporting period on marketable securities still held at the reporting date

   $ (9,501 )   $ 441,248     $ 31,995     $ 513,949  
Marketable Securities [Table Text Block]
June 30, 2024 (unaudited)                   Unrealized  
    Cost     Fair value     gain  

Equity and other mutual funds

   $ 583,103     $ 617,086     $ 33,983  
                         

Other short-term investments:

                        

Fixed income Certificates of Deposit (original maturities >3 months)

     836,456       836,456       -  

Total marketable securities

   $ 1,419,559     $ 1,453,542     $ 33,983  
December 31, 2023 (audited)                   Unrealized  
    Cost     Fair Value     gain  

Equity Securities

                        

Equity and other mutual funds

   $ 574,330     $ 576,318     $ 1,988  
                         

Other short-term investments:

                        

Fixed income Certificates of Deposit (original maturities >3 months)

     275,000       275,000       -  

Total marketable securities

   $ 849,330     $ 851,318     $ 1,988