Note E - Marketable Securities (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Marketable Securities [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	$ (19,000)	$ (33,000)	$ (83,000)	$ (140,000)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ (12,000)	$ (21,000)	$ (56,000)	$ (92,000)