Note 6 - Leases (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 27, 2020	Dec. 29, 2019
Operating Lease, Payments	$ 493,000	$ 362,000	$ 1,300,000	$ 1,100,000
Operating Lease, Weighted Average Remaining Lease Term (Year)	2 years 328 days		2 years 328 days
Operating Lease, Weighted Average Discount Rate, Percent	3.67%		3.67%