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Marketable Securities
 12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Note 4 - Marketable Securities
The Company's investment in marketable securities as of December 31, 2021 and 2022 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, 2022
                        
Held to maturity:
                        
Corporate debt securities and government debt securities
                        
Current
    
4,038
      
-
      
(111
)
    
3,927
  
Non-Current (1 to 3 years)
    
15,283
      
-
      
(1,214
)
    
14,069
  
                                 
     
19,321
      
-
      
(1,325
)
    
17,996
  
                                 
At December 31, 2021
                                
Held to maturity:
                                
Corporate debt securities and government debt securities
                                
Current
    
8,300
      
43
      
(19
)
    
8,324
  
Non-Current (1 to 4 years)
    
23,966
      
10
      
(512
)
    
23,464
  
                                 
     
32,266
      
53
      
(531
)
    
31,788
  
*
Fair value is being determined using Level 2 inputs.
**
Including accrued interest in the amount of US$ 227 thousand and US$ 138 thousand as of December 31, 2021 and 2022, respectively.
   
 
The accrued interest is presented as part of other receivables on the balance sheet.
   
Activity in marketable securities in 2022
  
US$ thousands
  
       
Balance at January 1, 2021
    
50,810
  
         
Purchases of marketable securities
    
19,927
  

Changes in marketable securities, net

    
(621
)
Proceeds from maturity of marketable securities
    
(37,850
)
         
Balance at January 1, 2022
    
32,266
  
         
Purchases of marketable securities
    
3,998
  

Changes in marketable securities, net

    
(914
)
Proceeds from maturity of marketable securities
    
(16,029
)
         
Balance at December 31, 2022
    
19,321
  
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, 2022:

 

   
Less than 12 months
    
12 months or more
    
Total
  
   
Unrealized Losses
    
Fair value
    
Unrealized Losses
    
Fair value
    
Unrealized Losses
    
Fair value
  
Held to maturity:
                                     
Corporate debt securities and government debt securities
    
(301
)
    
4,595
      
(1,024
)
    
13,401
      
(1,325
)
    
17,996
  
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.