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Note 5 - Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30
,
   
December 31,
 
   
2018
   
2017
 
Raw Materials
  $
13,448
    $
14,606
 
Work In Process
   
1,857
     
2,013
 
Finished Goods
   
7,813
     
9,707
 
Total
  $
23,118
    $
26,326