Note 6 - Property and Equipment - Components of Property and Equipment (Details) - USD ($)	Apr. 30, 2024	Apr. 30, 2023	May 01, 2019
Assets [Abstract]
Property, Plant and Equipment, Net	$ 4,440,000	$ 5,788,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property and equipment, net	Property and equipment, net	Property and equipment, net
Building and leasehold improvements	$ 652,000	$ 1,013,000
Operating lease - right-of-use asset	Property and equipment, net	Property and equipment, net	Property and equipment, net
Operating lease - right-of-use asset	$ 4,090,000	$ 5,300,000	$ 9,575,000
Furniture and equipment	2,274,000	4,079,000
Property, Plant and Equipment, Gross	7,016,000	10,392,000
Accumulated depreciation and amortization	(2,576,000)	(4,604,000)
Property and equipment, net	$ 4,440,000	$ 5,788,000