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Note 10 - Agreements, Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
  

2022

  

2021

 

Balance at January 1,

 $962,313  $1,056,613 

Warranty costs charged to cost of goods sold

  86,256   177,302 

Utilization charges against reserve

  (93,653

)

  (191,068

)

Foreign currency effect

  (56,844

)

  (80,534

)

Balance at December 31,

 $898,072  $962,313