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Note 7 - Inventory (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

March 31,

   

December 31,

 

(in thousands)

 

2020

   

2019

 
Raw materials   $ 10,237     $ 9,818  
Work in process     499       501  

Total inventory

    10,736       10,319  
Allowance for obsolescence     (229 )     (244 )

Inventory, net of allowance

  $ 10,507     $ 10,075