Note 12 - Lease Commitments (Details Textual)			3 Months Ended	6 Months Ended
	Nov. 30, 2016 USD ($) ft²	Feb. 29, 2016 USD ($) ft²	Oct. 31, 2024 USD ($)	Oct. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)	Apr. 30, 2024 USD ($)	Oct. 03, 2021 USD ($)	May 01, 2019 USD ($)	Oct. 30, 2016 USD ($)
Operating Lease, Right-of-Use Asset			$ 3,571,000	$ 3,571,000		$ 4,090,000		$ 9,575,000
Operating Lease, Liability			4,196,000	4,196,000				10,340,000
Lease Incentive Receivable								$ 765,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]								Property and equipment, net
Operating Lease, Expense				$ 638,000	$ 750,000
Operating Lease, Payments			$ 708,000
Sublease to American Building Maintenance Industries, Incorporated [Member]
Area of Real Estate Property (Square Foot) | ft²	24,726
Operating Leases, Annual Base Rent	$ 1,126,000
Base Rent Increase, Percent	2.25%
Security Deposit							$ 305,000		$ 469,000
Lessee Leasing Arrangements, Allowance	$ 417,000
Lessee Leasing Arrangements, Allowance, Six Months of Free Rent Payment	$ 563,000
Seagis Property Group LP (the "Landlord") [Member] | Value Line Distribution Center ("VLDC") [Member]
Area of Real Estate Property (Square Foot) | ft²		24,110
Security Deposit		$ 32,146
Base Rent Increase Amount		$ 237,218