Note 6 - Retirement Plan (Details Textual) - USD ($)	12 Months Ended
	Mar. 28, 2021	Mar. 29, 2020	Mar. 31, 2019
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 266,000	$ 291,000
First 2% Employee Contributions [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	100.00%	100.00%	100.00%
Defined Contribution Plan Employee Contribution Percent	2.00%	2.00%	2.00%
Next 3% Employee Contributions [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	50.00%	50.00%	50.00%
Defined Contribution Plan Employee Contribution Percent	3.00%	3.00%	3.00%