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Note 8 - Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
 
 
March 31,
2018
 
 
December 31,
2017
Raw materials   $
10,062
    $
11,296
 
Work-in-process    
5,899
     
6,062
 
Finished goods    
6,809
     
4,677
 
Total   $
22,770
    $
22,035