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Note D - Summary of Nonvested Options and Restricted Stock (Details)
 6 Months Ended
Jun. 30, 2016
$ / shares
shares
Employee Stock Option [Member]  
Nonvested at Beginning of Period (in shares) | shares 28,205
Nonvested - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 6.07
Canceled/forfeited/expired - Number of Options (in shares) | shares (2,050)
Canceled/forfeited/expired - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 6.07
Vested (in shares) | shares (12,800)
Vested (in dollars per share) | $ / shares $ 6.06
Nonvested at End of Period (in shares) | shares 13,355
Nonvested - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 6.07
Restricted Stock [Member]  
Nonvested at Beginning of Period (in shares) | shares 5,700
Nonvested - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 42.65 [1]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares 7,275
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 30.81 [1]
Canceled/forfeited/expired (in shares) | shares (450)
Canceled/forfeited/expired - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 42.65 [1]
Vested (in shares) | shares (3,525)
Vested - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 30.80 [1]
Nonvested at End of Period (in shares) | shares 9,000
Nonvested - Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 37.72 [1]
[1] The weighted-average grant date fair value was based on the closing price of the Company's stock on the date of the grant.