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Note 5 - Inventories (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    September 30,
2017
 
December 31,
2016
Raw materials   $
6,660
    $
7,111
 
Work in process    
1,161
     
1,354
 
Finished goods    
5,315
     
5,686
 
Total inventory   $
13,136
    $
14,151