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Note 4 - Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
   
December 31,
 
   
2021
   
2020
 
Raw materials
  $
25,406
    $
14,586
 
Work-in-process
   
14,272
     
12,634
 
Finished goods
   
2,843
     
2,704
 
     
42,521
     
29,924
 
Less: Reserve for excess and obsolete inventory
   
(2,245
)    
(3,200
)
Net inventories
  $
40,276
    $
26,724