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Note 7 - Agreements and Commitments (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   

March 31,

2024

   

December 31,

2023

 

Balance at January 1

  $ 629,100     $ 898,072  

Warranty costs charged to cost of goods sold

    47,455       115,401  

Utilization charges against reserve

    -       (408,234 )

Foreign currency effect

    (13,955 )     23,861  

Balance at the end of the period

  $ 662,600     $ 629,100