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Note 7 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    December 31,
    2019   2018
    (in thousands)
Finished goods   $
5,561
    $
6,936
 
Work in process    
3,153
     
3,667
 
Raw materials    
13,347
     
14,484
 
Total   $
22,061
    $
25,087