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Note 7 - Inventory (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

September 30,

   

December 31,

 

(in thousands)

 

2019

   

2018

 
Raw materials   $ 9,328     $ 9,560  
Work in process     304       792  

Total inventory

    9,632       10,352  
Allowance for obsolescence     (184 )     (265 )

Inventory, net of allowance

  $ 9,448     $ 10,087