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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventories [Abstract]  
Schedule of Inventories
 
December 31,
 
   
2018
   
2017
 
   
U.S. Dollars (in thousands)
 
Components
   
13,062
     
9,690
 
Work in process
   
7,654
     
6,584
 
Finished products *
   
11,449
     
6,445
 
                 
     
32,165
     
22,719
 

*          includes systems at customer locations not yet sold, as of December 31, 2018 and 2017, in the amount of $7,546 and $3,425 respectively.
Balance Sheet Presentation of Inventories
Inventories are presented in:

   
December 31,
 
   
2018
   
2017
 
   
U.S. Dollars (in thousands)
 
Current assets
   
30,109
     
21,336
 
Long-term assets (A)
   
2,056
     
1,383
 
                 
     
32,165
     
22,719