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

March 31,

   

December 31,

 
   

2020

   

2019

 
   

(Dollars in thousands)

 

Raw materials and purchased parts for assembly

  $ 20,559     $ 21,942  

Self-manufactured assembly parts and finished products

    13,548       13,007  

Total inventories

  $ 34,107     $ 34,949