Note 2 - Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Aug. 31, 2013 Income Approach Valuation Technique [Member]	Aug. 31, 2013 Income Approach Valuation Technique [Member] Minimum [Member]	Aug. 31, 2013 Income Approach Valuation Technique [Member] Maximum [Member]	Aug. 31, 2013 Auction Rate Securities [Member]	Mar. 02, 2013 Auction Rate Securities [Member]
Note 2 - Fair Value Measurements (Details) [Line Items]
Available For Sale Securities Temporary Impairment Adjustment Accumulated Other Comprehensive Income Loss (in Dollars)				$ 3.5	$ 2.0
Fair Value Inputs Coupon Rate		0.10%	0.15%
Estimated Redemption Period	5 years
Fair Value Inputs, Discount Rate	1.54%