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Note 8 - Inventory (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
   
December 31,
 
(in thousands)
 
2018
   
2017
 
Raw materials
  $
9,424
    $
9,767
 
Work in process
   
532
     
1,998
 
Total inventory
   
9,956
     
11,765
 
Allowance for obsolescence
   
(348
)    
(494
)
Inventory, net of allowance
  $
9,608
    $
11,271