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Marketable Securities
 12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Note 4 - Marketable Securities
 
 
The Company's investments in marketable securities as of December 31, 2023 and 2024 are classified as ''held-to-maturity'' and consist of the following:

 

         
Gross
    
Gross
        
         
unrealized
    
unrealized
        
   
Amortized
    
holding
    
holding
    
Aggregate
  
   
cost basis**
    
gains
    
(losses)
    
fair value*
  
   
US$ thousands
  
At December 31, 2024
                        
Held to maturity:
                        
Corporate debt securities and government debt securities
                        
Current
    
20,990
      
-
      
(171
)
    
20,819
  
Non-Current (1 to 3 years)
    
6,891
      
10
      
(61
)
    
6,840
  
                                 
     
27,881
      
10
      
(232
)
    
27,659
  
                                 
At December 31, 2023
                                
Held to maturity:
                                
Corporate debt securities and government debt securities
                                
Current
    
8,022
      
-
      
(121
)
    
7,901
  
Non-Current (1 to 4 years)
    
16,742
      
-
      
(558
)
    
16,184
  
     
24,764
      
-
      
(679
)
    
24,085
  
 
*
Fair value is being determined using Level 2 inputs.
**
Including accrued interest in the amount of US$ 188 thousand and US$ 182 thousand as of December 31, 2023 and 2024, respectively.
 
The accrued interest is presented as part of other receivables on the balance sheet.
 
Activity in marketable securities in 2023 and 2024
  
US$ thousands
  
       
Balance at January 1, 2023
    
19,321
  
         
Purchases of marketable securities
    
9,623
  
Changes in marketable securities, net
    
(180
)
Proceeds from maturity of marketable securities
    
(4,000
)
         
Balance at January 1, 2024
    
24,764
  
         
Purchases of marketable securities
    
11,100
  
Changes in marketable securities, net
    
(33
)
Proceeds from maturity of marketable securities
    
(7,950
)
         
Balance at December 31, 2024
    
27,881
  
 
 
The following table summarizes the gross unrealized losses or gains on investment securities and the fair value of those securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss or gain position, at December 31, 2024:

 

   
Less than 12 months
    
12 months or more
    
Total
  
Held to maturity:
  
Unrealized Losses
    
Fair value
    
Unrealized Losses
    
Fair value
    
Unrealized Losses
    
Fair value
  
                                     
Corporate debt securities and government debt securities
    
(38
)
    
11,102
      
(194
)
    
14,585
      
(232
)
    
25,687
  
 
   
Less than 12 months
    
12 months or more
    
Total
  
Held to maturity:
  
Unrealized Gains
    
Fair value
    
Unrealized Gains
    
Fair value
    
Unrealized Gains
    
Fair value
  
                                     
Corporate debt securities and government debt securities
    
7
      
990
      
3
      
982
      
10
      
1,972
  
 
 
The unrealized losses or gains on the investments were caused by changes in interest rate. The Company has the ability and intent to hold these investments until maturity and it is more likely than not that the Company will not be required to sell any of the securities before recovery.