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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of held-to-maturity securities
 
         
Gross
    
Gross
        
         
unrealized
    
unrealized
        
   
Amortized
    
holding
    
holding
    
Aggregate
  
   
cost basis**
    
gains
    
(losses)
    
fair value*
  
   
US$ thousands
  
At December 31, 2023
                        
Held to maturity:
                        
Corporate debt securities and government debt securities
                        
Current
    
8,022
      
-
      
(121
)
    
7,901
  
Non-Current (1 to 3 years)
    
16,742
      
-
      
(558
)
    
16,184
  
     
24,764
      
-
      
(679
)
    
24,085
  
                                 
At December 31, 2022
                                
Held to maturity:
                                
Corporate debt securities and government debt securities
                                
Current
    
4,038
      
-
      
(111
)
    
3,927
  
Non-Current (1 to 4 years)
    
15,283
      
-
      
(1,214
)
    
14,069
  
                                 
     
19,321
      
-
      
(1,325
)
    
17,996
  
 
*
Fair value is being determined using Level 2 inputs.
**
Including accrued interest in the amount of US$ 138 thousand and US$ 188 thousand as of December 31, 2022 and 2023, respectively.
Schedule of reconciliation of marketable securities
Activity in marketable securities in 2023 and 2022
  
US$ thousands
  
       
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 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 December 31, 2023
    
24,764
  
Schedule of investment securities in unrealized loss position
 
   
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
    
(99
)
    
8,690
      
(580
)
    
15,395
      
(679
)
    
24,085