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	3 Months Ended
	May 31, 2014
Employee Stock Option [Member]
Note 6 - Stock-Based Compensation (Details) - Changes in the Company’s Stock Options [Line Items]
Options outstanding, beginning of period	4,192
Options outstanding, beginning of period	$ 46.85
Granted	523
Granted	$ 62.34
Exercised	(252)
Exercised	$ 38.56
Forfeited or expired	0
Forfeited or expired
Options outstanding, end of period	4,463
Options outstanding, end of period	$ 49.13
Options exercisable, end of period	2,765
Options exercisable, end of period	$ 41.92