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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

December 31,

 
   

2022

   

2021

 
   

(Dollars in thousands)

 

Raw materials and purchased parts for assembly

  $ 10,629     $ 11,539  

Self-manufactured assembly parts and finished products

    12,203       16,906  

Total

  $ 22,832     $ 28,445