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Note 7 - Inventory (Tables)
6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

June 30,

   

December 31,

 

(in thousands)

 

2020

   

2019

 
Raw materials   $ 10,784     $ 9,818  
Work in process     228       501  

Total inventory

    11,012       10,319  
Allowance for obsolescence     (238 )     (244 )

Inventory, net of allowance

  $ 10,774     $ 10,075