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Note 3 - Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

September 30,

   

December 31,

 
   

2019

   

2018

 
   

(Dollars in thousands)

 

Raw materials and purchased parts for assembly

  $ 30,108     $ 26,914  

Self-manufactured assembly parts and finished products

    9,216       18,110  

Total

  $ 39,324     $ 45,024