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Note 11 - Agreements, Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

2023

  

2022

 

Balance at January 1,

 $898,072  $962,313 

Warranty costs charged to cost of goods sold

  115,401   86,256 

Utilization charges against reserve

  (408,234)  (93,653)

Foreign currency effect

  23,861   (56,844)

Balance at December 31,

 $629,100  $898,072