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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

December 31,

 
  

2021

  

2020

 
  

(Dollars in thousands)

 

Raw materials and purchased parts for assembly

 $11,539  $14,835 

Self-manufactured assembly parts and finished products

  16,906   20,486 

Total

 $28,445  $35,321