Note 7 - Inventory (Tables)
 9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
    
December 31,
 
(in thousands)
  
2016
    
2015
  
Raw materials
   $ 9,226     $ 8,589  
Work in process
     1,105       1,529  
Total inventory
     10,331       10,118  
Allowance for obsolescence
     (401 )     (347 )
Inventory, net of allowance
   $ 9,930     $ 9,771