Note 4 - Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 23, 2012	Dec. 25, 2011	Dec. 23, 2012	Dec. 25, 2011
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	$ (55)	$ (27)	$ (119)	$ 59
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ (35)	$ (18)	$ (75)	$ 40