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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    December 31,
    2017   2016
Raw materials   $
6,898
    $
7,111
 
Work in process    
1,207
     
1,354
 
Finished goods    
4,758
     
5,686
 
Total Inventory   $
12,863
    $
14,151