Note D - Revenues - Revenues by Geographical Market (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 28, 2020	Jun. 30, 2019
Revenues	$ 17,686	$ 30,518
UNITED STATES
Revenues	17,412	29,387
Non-US [Member]
Revenues	$ 274	$ 1,131