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Cash Equivalents and Investments (Tables)
9 Months Ended
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
                                 
 
September 30, 2019
   
December 31, 2018
 
 
Short-Term
   
Long-Term
   
Short-Term
   
Long-Term
 
Municipal debt securities
  $
36,256
    $
 
 
    $
18,473
    $
30,841
 
Federal home loan securities
   
23,825
     
 
 
     
2,000
     
34,393
 
Corporate securities
   
13,823
     
 
 
     
 
 
     
 
Certificates of deposit
   
4,467
     
 
 
     
1,450
     
4,465
 
                                 
  $
78,371
    $
 
 
    $
21,923
    $
69,699