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Other Income (Expense), Net (Tables)
 12 Months Ended
Dec. 31, 2020
Other Income and Expenses [Abstract]  
Components of Other Income
The major changes in the components of Other income (expense), net for the years ended December 31 were as follows (in thousands):
 
    
2020
     
2019
     
2018
  
Rental income, net
    $ 792      $ 792      $ 792  
Foreign currency gains (losses), net
      181        (108 )       (260 ) 
Interest income
      95        300        257  
Gain on disposal of equipment
      13        38        57  
Credit gains on
available-for-sale
securities
      4        4        7  
Other
      8        40        21  
    
 
 
     
 
 
     
 
 
  
     $ 1,093      $ 1,066      $ 874