Note 9 - Property and Equipment - Components of Property and Equipment (Details) - USD ($)	Jan. 31, 2024	Apr. 30, 2023	May 01, 2019
Building and leasehold improvements	$ 1,013,000	$ 1,013,000
Furniture and equipment	4,092,000	4,079,000
Property, Plant and Equipment, Gross	9,504,000	10,392,000
Accumulated depreciation and amortization	(4,707,000)	(4,604,000)
Property and equipment, net	4,797,000	5,788,000
Property and Equipment [Member]
Operating lease - right-of-use asset	$ 4,399,000	$ 5,300,000	$ 9,575,000