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Note 10 - Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
September 30, 2023 

Estimated Fair Value

  

Level 1

  

Level 2

  

Level 3

 
                 

Assets:

                

Money market account 

 $91,957  $91,957  $-  $- 

December 31, 2022

 

Estimated Fair Value

  

Level 1

  

Level 2

  

Level 3

 

Assets:

                

Money market account 

 $102,681  $102,681  $-  $-