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Note 7 - Inventory (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
Raw materials
  $
15,139
    $
12,354
 
Work in process
  $
5,889
    $
6,331
 
Finished goods
  $
1,675
    $
1,313
 
Reserve for excess and obsolete inventory
  $
(1,919
)   $
(1,414
)
Total
  $
20,784
    $
18,584