Note G - Marketable Securities (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax			$ 47,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax			$ 25,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax		$ (19,000)		$ (83,000)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax		$ (12,000)		$ (56,000)