Note 6 - Stock-Based Compensation (Details) - Changes in the Company’s Stock Options (Employee Stock Option [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Aug. 31, 2013
Employee Stock Option [Member]
Note 6 - Stock-Based Compensation (Details) - Changes in the Company’s Stock Options [Line Items]
Options outstanding, beginning of period	5,006
Options outstanding, beginning of period (in Dollars per share)	$ 42.32
Granted	563
Granted (in Dollars per share)	$ 69.78
Exercised	(916)
Exercised (in Dollars per share)	$ 39.54
Forfeited or expired	(2)
Forfeited or expired (in Dollars per share)	$ 37.79
Options outstanding, end of period	4,651
Options outstanding, end of period (in Dollars per share)	$ 46.19
Options exercisable, end of period	2,862
Options exercisable, end of period (in Dollars per share)	$ 39.28