Note 3 - Marketable Securities (Tables)

9 Months Ended

Nov. 30, 2014

Notes Tables

Schedule of Fair Value of Separate Accounts by Major Category of Investment [Table Text Block]

	November 30, 2014
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	114,742	$	114,742	$	-	$	-
U.S. corporate debt securities		20,309		6,290		14,019		-
Total marketable securities	$	135,051	$	121,032	$	14,019	$	-

	March 2, 2014
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	112,793	$	112,793	$	-	$	-
U.S. corporate debt securities		24,413		17,329		7,084		-
Total marketable securities	$	137,206	$	130,122	$	7,084	$	-

Schedule of Unrealized Loss on Investments [Table Text Block]

	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses
November 30, 2014:
U.S. Treasury and other government securities	$	114,386	$	363	$	7
U.S. corporate debt securities		20,311		8		10
Total marketable securities	$	134,697	$	371	$	17
March 2, 2014:
U.S. Treasury and other government securities	$	112,593	$	200	$	-
U.S. corporate debt securities		24,401		13		1
Total marketable securities	$	136,994	$	213	$	1

Realized Gain (Loss) on Investments [Table Text Block]

	13 Weeks Ended				39 Weeks Ended
	November 30, 2014		December 1, 2013		November 30, 2014		December 1, 2013
Gross realized gains on sale	$	5	$	12	$	5	$	23
Gross realized losses on sale	$	-	$	324	$	-	$	485

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	70,779
Due after one year through five years		64,272
	$	135,051