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Other Income (Expense), Net (Tables)
 12 Months Ended
Dec. 31, 2019
Other Income and Expenses [Abstract]  
Components of Other Income
15.
 
OTHER INCOME (EXPENSE), NET
The major changes in the components of Other income (expense), net for the years ended December 31 were as follows (in thousands):
 
2019
 
  
2018
 
  
2017
 
Rental income
  $
792
     $
792
     $
792
  
Interest income
   
300
      
257
      
124
  
Foreign currency losses, net
   
(108
 )    
(260
 )    
323
  
Gain on disposal of equipment
   
38
      
57
      
14
  
Credit gains on
available-for-sale
securities
    
4
      
7
      
11
  
Other
   
40
      
21
      
(2
 )
                         
   $
1,066
     $
874
     $
1,262