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Note 6 - Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
   
December 31,
 
   
2019
   
2018
 
Raw materials
  $
50,431
    $
63,348
 
Work in progress
   
28,514
     
21,441
 
Finished goods
   
31,264
     
35,279
 
Inventories
  $
110,209
    $
120,068