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Note D - Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Share-based Compensation, Activity [Table Text Block]
   
Shares Under Options
   
Weighted-Average Exercise Price
   
Weighted- Average Remaining Contractual Term
   
Aggregate Intrinsic Value*
 
           
(per share)
   
(in years)
         
Outstanding at January 1, 2016
    66,098     $ 10.92                  
Granted
    -       -                  
Exercised
    (6,450 )     11.50                  
Cancelled/forfeited/expired
    (2,050 )     10.91                  
Outstanding at June 30, 2016
    57,598     $ 10.86       3.8     $ 289,835  
                                 
Exercisable at June 30, 2016
    44,243     $ 10.84       3.1     $ 223,371  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
   
Stock Options
   
Restricted Stock
 
   
Number of Options
   
Weighted- Average Grant Date Fair Value
   
Number of Shares
   
Weighted- Average Grant Date Fair Value*
 
Nonvested at January 1, 2016
    28,205     $ 6.07       5,700     $ 42.65  
Granted
    -       -       7,275       30.81  
Canceled/forfeited/expired
    (2,050 )     6.07       (450 )     42.65  
Vested
    (12,800 )     6.06       (3,525 )     30.80  
Nonvested at June 30, 2016
    13,355     $ 6.07       9,000     $ 37.72  
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Exercise Price
   
Shares Under Outstanding Options
   
Weighted-Average Remaining Contractual Term
   
Shares Under Exercisable Options
 
               
(in years)
         
$ 10.44       15,000       1.7       15,000  
$ 10.90       6,000       0.9       6,000  
$ 10.90       26,600       5.9       13,800  
$ 11.22       5,998       4.4       5,443  
$ 11.54       4,000       0.7       4,000  
          57,598       3.8       44,243