Note 9 - Property and Equipment - Components of Property and Equipment (Details) - USD ($)	Jan. 31, 2021	Jan. 01, 2021	Apr. 30, 2020	May 01, 2019
Building and leasehold improvements	$ 1,013,000		$ 1,013,000
Operating lease - right-of-use asset	7,784,000	$ 7,784,000	8,550,000	$ 9,575,000
Furniture and equipment	4,073,000		4,047,000
Property, Plant and Equipment, Gross, Ending Balance	12,870,000		13,610,000
Accumulated depreciation and amortization	(4,257,000)		(4,110,000)
Total property and equipment, net	$ 8,613,000		$ 9,500,000