Note 9 - Property and Equipment - Components of Property and Equipment (Details) - USD ($)	Jan. 31, 2023	Apr. 30, 2022	May 01, 2019
Building and leasehold improvements	$ 1,013,000	$ 1,013,000
Operating lease - right-of-use asset	5,591,000	6,442,000	$ 9,575,000
Furniture and equipment	4,115,000	4,091,000
Property, Plant and Equipment, Gross, Ending Balance	10,719,000	11,546,000
Accumulated depreciation and amortization	(4,608,000)	(4,488,000)
Total property and equipment, net	$ 6,111,000	$ 7,058,000