Note K - Accounting for Stock-Based Compensation (Details) - Stock Options Outstanding, by Exercise Price Range (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding	10 years
Price Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 9.05
Range of Exercise Prices, Upper Limit	$ 25.00
Number Outstanding	6 years 73 days
Weighted Average Remaining Contractual Term	$ 21.70
Weighted Average Exercise Price, Outstanding (in Shares)	241,765
Number Exercisable	$ 21.67
Weighted Average Exercise Price, Exercisable (in Shares)	306,472
Price Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 25.01
Range of Exercise Prices, Upper Limit	$ 27.00
Number Outstanding	8 years 76 days
Weighted Average Remaining Contractual Term	$ 25.66
Weighted Average Exercise Price, Outstanding (in Shares)	49,486
Number Exercisable	$ 25.66
Weighted Average Exercise Price, Exercisable (in Shares)	169,373
Price Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 27.01
Range of Exercise Prices, Upper Limit	$ 28.00
Number Outstanding	9 years 76 days
Weighted Average Remaining Contractual Term	$ 27.03
Weighted Average Exercise Price, Exercisable (in Shares)	218,707
Price Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 9.05
Range of Exercise Prices, Upper Limit	$ 28.00
Number Outstanding	7 years 233 days
Weighted Average Remaining Contractual Term	$ 24.34
Weighted Average Exercise Price, Outstanding (in Shares)	291,251
Number Exercisable	$ 22.35
Weighted Average Exercise Price, Exercisable (in Shares)	694,552