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Note 7 - Agreements and Commitments (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

March 31,

2023

  

December 31,

2022

 

Balance at January 1

 $898,072  $962,313 

Warranty costs charged to cost of goods sold

  22,579   86,256 

Utilization charges against reserve

  (239,052

)

  (93,653

)

Foreign currency effect

  13,343   (56,844

)

Balance at the end of the period

 $694,943  $898,072