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Fair Value and Equity Investments (Tables)
 3 Months Ended
Mar. 31, 2026
Fair Value and Equity Investments [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following tables present the fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis (U.S. dollars in thousands):

   
Fair Value at March 31, 2026
  
   
Level 1
    
Level 2
    
Level 3
    
Total
  
Financial assets:
                        
Cash equivalents and current investments
  
$
16,127
    
$
-
    
$
-
    
$
16,127
  
Life insurance contracts
    
-
      
-
      
47,276
      
47,276
  
Total
  
$
16,127
    
$
-
    
$
47,276
    
$
63,403
  
   
Fair Value at December 31, 2025
  
   
Level 1
    
Level 2
    
Level 3
    
Total
  
Financial assets:
                        
Cash equivalents and current investments
  
$
39,084
    
$
-
    
$
-
    
$
39,084
  
Life insurance contracts
    
-
      
-
      
48,410
      
48,410
  
Total
  
$
39,084
    
$
-
    
$
48,410
    
$
87,494
  
Changes in Fair Value of Level 3 Life Insurance Contracts
The following table provides a summary of changes in fair value of the Company’s Level 3 life insurance contracts (U.S. dollars in thousands):

   
2026
    
2025
  
Beginning balance at January 1
  
$
48,410
    
$
44,091
  
Actual return on plan assets
    
(1,134
)
    
(1,617
)
Ending balance at March 31
  
$
47,276
    
$
42,474