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Note 6 - Inventories (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
As of December 31,
  
   
2020
    
2019
  
Raw materials
   $
14,586
     $
22,759
  
Work-in-process
    
12,634
      
8,366
  
Finished goods
    
2,704
      
2,915
  
     
29,924
      
34,040
  
Less: Reserve
    
(3,200
 )    
(2,177
 )
Net inventories
   $
26,724
     $
31,863