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Intangible Assets, Net
12 Months Ended
Dec. 31, 2018
Intangible Assets, Net [Abstract]  
Intangible Assets, Net
Note 7 - Intangible Assets, Net

   
December 31,
 
   
2018
   
2017
 
   
U.S. Dollars (in thousands)
 
             
Patent registration costs
   
1,605
     
1,513
 
                 
Accumulated amortization
   
1,129
     
1,031
 
                 
Total intangible asset, net
   
476
     
482
 
 
 
Patent registration costs are amortized over their estimated useful life of 10 years.

Amortization expense for the years ended December 31, 2018, 2017 and 2016 amounted to $98, $121 and $141, respectively.
 
As of December 31, 2018, the estimated amortization expenses of intangible assets for the years 2019 to 2023 is as follows:

Year ended December 31,
 
U.S. Dollars
(in thousands)
 
2019
   
76
 
2020
   
74
 
2021
   
74
 
2022
   
68
 
2023
   
56
 
     
348