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Note D - Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2015
Disclosure Text Block Supplement [Abstract]  
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, 2015

    86,348     $ 11.09                  

Granted

    -       -                  

Exercised

    (19,800 )     11.66                  

Cancelled/forfeited/expired

    -       -                  

Outstanding at June 30, 2015

    66,548     $ 10.92       4.7     $ 3,136,135  
                                 

Exercisable at June 30, 2015

    32,239     $ 10.88       2.5     $ 1,520,612  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
   

Number of Options

   

Weighted- Average Grant Date Fair Value

 
                 

Nonvested at January 1, 2015

    48,109     $ 6.10  

Granted

    -       -  

Canceled/forfeited/expired

    -       -  

Vested

    (13,800 )     6.06  

Nonvested at June 30, 2015

    34,309     $ 6.11  
   

Number of Options

   

Weighted- Average Grant Date Fair Value

 
                 

Nonvested at January 1, 2015

    7,600     $ 42.65  

Granted

    1,225       57.27  

Canceled/forfeited/expired

    -       -  

Vested

    (1,225 )     57.27  

Nonvested at June 30, 2015

    7,600     $ 42.65  
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       2.7       15,000  
$ 10.90       6,000       1.9       6,000  
$ 10.90       29,600       6.9       2,000  
$ 11.22       7,948       5.4       1,239  
$ 11.54       4,000       1.7       4,000  
$ 11.75       4,000       0.7       4,000  
          66,548       4.7       32,239