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Marketable Securities
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Note 5 - Marketable Securities
The Company's investment in marketable securities as of December 31, 2020 and 2021 are classified as ''held-to-maturity'' and consist of the following:
 
 
Amortized
cost basis**
 
 
Gross
unrealized
holding
gains
 
 
Gross
unrealized
holding
(losses)
 
 
Aggregate
fair value*
 
 
 
US$ thousands
 
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
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2020
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held to maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate debt securities and government debt securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Current
 
 
35,445
 
 
 
265
 
 
 
(102
)
 
 
35,608
 
Non-Current (1 to 5 years)
 
 
15,365
 
 
 
339
 
 
 
-
 
 
 
15,704
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
50,810
 
 
 
604
 
 
 
(102
)
 
 
51,312
 
*
Fair value is being determined using Level 2 inputs.
**
Including accrued interest in the amount of US$ 412 thousand and US$ 227 thousand as of December 31, 2020 and 2021, respectively.
   
 
The accrued interest is presented as part of other receivables on the balance sheet.
Activity in marketable securities in 2021
  
US$ thousands
  
       
Balance at January 1, 2020
    
61,125
  
         
Purchases of marketable securities
    
6,558
  
Discount on marketable securities, net
    
(244
)
Proceeds from maturity of marketable securities
    
(16,629
)
         
Balance at January 1, 2021
    
50,810
  
         
Purchases of marketable securities
    
19,927
  
Discount on marketable securities, net
    
(621
)
Proceeds from maturity of marketable securities
    
(37,850
)
         
Balance at December 31, 2021
    
32,266
  
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, 2021:

 

   
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
    
(531
)
    
25,814
      
—
      
—
      
(531
)
    
25,814
  
 
   
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
    
—
      
—
      
53
      
5,974
      
53
      
5,974
  
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.