Note 4 - Marketable Securities (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 29, 2013	Sep. 23, 2012	Sep. 29, 2013	Sep. 23, 2012
Table Text Block [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	$ (30,000)	$ (35,000)	$ (107,000)	$ (64,000)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ (21,000)	$ (20,000)	$ (71,000)	$ (40,000)