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Note 7 - Inventory (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
     
September 30,
    
December 31,
  
(in thousands)
  
2017
    
2016
  
Raw materials
   $
8,653
     $
8,057
  
Work in process
    
1,531
      
1,531
  
Total inventory
    
10,184
      
9,588
  
Allowance for obsolescence
    
(395
 )    
(278
 )
Inventory, net of allowance
   $
9,789
     $
9,310