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Note 5 - Cash and Cash Equivalents (Tables)
 6 Months Ended
Jun. 30, 2024
Notes Tables  
Schedule of Cash and Cash Equivalents [Table Text Block]
    June 30,     December 31,  
    2024     2023  

Demand Deposits

   $ 1,181,655     $ 340,034  

Certificates of Deposit (original maturities of < 3 months)

     -       125,000  

Money Market Funds

     178,770       1,031,361  

U.S. Treasury Bills (original 3-month maturity)

     7,044,946       6,746,727  

Total Cash and Cash Equivalents

   $ 8,405,371     $ 8,243,122