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Note N - Employee Benefits (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block]
   
Years ended December 31
 
   
2019
   
2018
   
2017
 
                         
Number of shares issued
   
8,333
     
7,294
     
15,118
 
                         
Fair value of stock contributed
  $
328
    $
295
    $
428
 
                         
Cash contributed
   
500
     
500
     
250
 
                         
Total expense
  $
828
    $
795
    $
678