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Note N - Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block]
   
Years ended December 31
  
   
2018
    
2017
    
2016
  
                         
Number of shares issued
    
7,294
      
15,118
      
24,572
  
                         
Fair value of stock contributed
   $
295
     $
428
     $
575
  
                         
Cash contributed
    
500
      
250
      
----
  
                         
Total expense
   $
795
     $
678
     $
575