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

June 30,

   

December 31,

 

(in thousands)

 

2019

   

2018

 

Raw materials

  $ 9,481     $ 9,560  

Work in process

    403       792  

Total inventory

    9,884       10,352  

Allowance for obsolescence

    (196 )     (265 )

Inventory, net of allowance

  $ 9,688     $ 10,087