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Note 8 - Inventory (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
  
   
2017
    
2016
  
Raw materials
   $
10,011
     $
8,187
  
Work in process
    
7,150
      
6,211
  
Finished goods
    
1,645
      
2,020
  
Reserve for excess and obsolete inventory
    
(1,165
 )    
(1,860
 )
Total   $
17,641
     $
14,558