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Note E - Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2019
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, 2019
   
100,917
    $
23.09
 
Granted
   
2,058
     
48.75
 
Canceled/forfeited/expired
   
-
     
-
 
Vested
   
(36,641
)    
18.69
 
Non-vested at June 30, 2019
   
66,334
    $
26.31