Note 13 - Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Statutory federal income tax (benefit)	$ (164)	$ (210)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Change in valuation allowance	$ (154)	$ (42)
Valuation allowance, percent	(19.80%)	4.20%
State income tax, net of federal benefit	$ (54)	$ (70)
State income tax, net of federal benefit, percent	6.90%	7.00%
Net operating loss expiration		$ 39
Net operating loss expiration, percent	0.00%	(3.90%)
Non tax-deductible expenses	$ 81	$ (15)
Non tax-deductible expenses, percent	(10.40%)	1.50%
Tax credits generated	$ (18)	$ (2)
Tax credits generated, percent	2.30%	0.20%
Adoption of ASC 606 adjustment		$ 329
Adoption of ASC 606 adjustment, percent	0.00%	(32.90%)
Other	$ 3	$ 13
Other, percent	(0.50%)	(1.30%)
Provision for income taxes	$ 2	$ 42
Effective income tax, percent	(0.50%)	(4.20%)