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Fair Value and Equity Investments (Tables)
6 Months Ended
Jun. 30, 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 June 30, 2026
 
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Financial assets:
                       
Cash equivalents and current investments
 
$
20,752
   
$
-
   
$
-
   
$
20,752
 
Life insurance contracts
   
-
     
-
     
52,149
     
52,149
 
Total
 
$
20,752
   
$
-
   
$
52,149
   
$
72,901
 

   
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
   
3,739
     
1,935
 
Ending balance at June 30
 
$
52,149
   
$
46,026