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Note E - Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
   
Restricted Stock
  
   
Number of
Shares
    
Weighted-
Average Grant
Date Fair Value
  
Non-vested at January 1, 2020
    
55,459
     $
24.35
  
Granted
    
9,608
      
49.47
  
Canceled/forfeited/expired
    
(357
 )    
56.45
  
Vested
    
(2,608
 )    
30.75
  
Non-vested at March 31, 2020
    
62,102
     $
27.78