Note E - Marketable Securities (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Marketable Securities Disclosure [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	$ (32,000)	$ (30,000)	$ (64,000)	$ (107,000)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ (22,000)	$ (21,000)	$ (44,000)	$ (71,000)