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Note 3 - Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    March 31,
2020
  December 31,
2019
         
Finished goods   $
61,805
    $
91,410
 
Raw materials    
60,335
     
69,821
 
Work-In-Process    
33,543
     
28,925
 
Total   $
155,683
    $
190,156