Note J - Revenues - Revenues by Geographical Market (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Sep. 23, 2018	Sep. 24, 2017		Sep. 23, 2018		Sep. 24, 2017
Revenues	$ 29,330	$ 31,471	[1]	$ 59,498	[1]	$ 62,274	[1]
UNITED STATES
Revenues	28,620	29,779		57,476		58,643
Non-US [Member]
Revenues	$ 710	$ 1,692		$ 2,022		$ 3,631

[1] As disclosed in Note B, prior period amounts have not been adjusted under the modified retrospective method of adoption of ASC 606.