XML 41 R31.htm IDEA: XBRL DOCUMENT v3.25.1
Note 10 - Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2025
Notes Tables  
Gain (Loss) on Securities [Table Text Block]
   

Three months ended March 31,

  
    2025     2024  

Net gains recognized during the period on marketable securities

   $ 12,350     $ 41,496  

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

     1,507       -  

Net unrealized gains recognized during the reporting period on marketable securities still held at the reporting date

   $ 13,857     $ 41,496  
Marketable Securities [Table Text Block]
    Cost     Fair Value    

Unrealized Gain

  

Equity securities:

                        

Equity and other mutual funds

   $ 639,217     $ 682,051     $ 42,834  
                         

Other short-term investments:

                        

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

     370,000       370,000       -  
                         

U.S. Treasury Bills (original maturities > 3 months)

     5,799,946       5,799,946       -  
                         

Total other short-term investments

     6,169,946       6,169,946       -  
                         

Total marketable securities

   $ 6,809,163     $ 6,851,997     $ 42,834  
    Cost     Fair Value    

Unrealized Gain

 

Equity securities:

                        

Equity and other mutual funds

   $ 634,705     $ 663,682     $ 28,977  
                         

Other short-term investments:

                        

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

     570,000       570,000       -  
                         

U.S. Treasury Bills (original maturities > 3 months)

     6,288,943       6,288,943       -  
                         

Total other short-term investments

     6,858,943       6,858,943       -  
                         

Total marketable securities

   $ 7,493,648     $ 7,522,625     $ 28,977