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Note 5 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    December 31,
    2019   2018
Raw materials   $
10,540
    $
11,727
 
Work in process    
2,279
     
2,521
 
Finished goods    
5,457
     
5,328
 
Total Inventory   $
18,276
    $
19,576