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Note 8 - Agreements, Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2024
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

December 31,

  

December 31,

 
  

2024

  

2023

 

Balance at January 1

 $629,100  $898,072 

Warranty costs charged to cost of goods sold

  100,726   115,401 

Utilization charges against reserve

  (72,736)  (408,234)

Foreign currency effect

  (36,059)  23,861 

Balance at the end of the period

 $621,031  $629,100