Note D - Revenues - Revenues by Geographical Market (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 27, 2020	Dec. 29, 2019
Revenues	$ 18,030	$ 21,376	$ 57,555	$ 81,620
UNITED STATES
Revenues	17,810	20,308	56,723	77,930
Non-US [Member]
Revenues	$ 220	$ 1,068	$ 832	$ 3,690