Note E - Marketable Securities (Details) (USD $)	3 Months Ended
	Jun. 29, 2014	Jun. 30, 2013
Marketable Securities Disclosure [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	$ (32,000)	$ (77,000)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ (22,000)	$ (50,000)