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Note 5 - Agreements and Commitments (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
2019
 
Balance at December 31, 2018
  $
432,225
 
Current year warranty expense
   
903,216
 
Change in estimate related to pre-existing warranties
 
 
-
 
Payments made
   
(275,736
)
Foreign currency effect
   
1,901
 
Balance at
June 30
, 2019
  $
1,061,606