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Note 8 - Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    September 30,
2018
    December 31,
2017
 
Raw materials   $
13,241
    $
11,296
 
Work-in-process    
5,948
     
6,062
 
Finished goods    
4,639
     
4,677
 
Total   $
23,828
    $
22,035