Note N - Share-based Compensation - Compensation Cost Charged to Expense Under All Stock-based Incentive Awards (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 25, 2022	Sep. 26, 2021	Sep. 25, 2022	Sep. 26, 2021
Share-based compensation expense	$ 8	$ 29	$ 16	$ 58
Share-Based Payment Arrangement, Option [Member]
Share-based compensation expense	8	23	16	44
Restricted Stock [Member]
Share-based compensation expense	$ 0	$ 6	$ 0	$ 14