Note 6 - Warranty Costs (Details Textual) - USD ($) $ in Thousands	Apr. 30, 2024	Apr. 30, 2023
Product Warranty Liability [Line Items]
General Liability Insurance Deductible	$ 30,000	$ 25,000
Bodily Injury Insurance Deductible	250
Bodily Injury Insurance Deductible for Action Over Claims	500
Bodily Injury Insurance Limit	$ 30,000	5,000
CALIFORNIA
Product Warranty Liability [Line Items]
Bodily Injury Insurance Deductible		500
All States Other Than California [Member]
Product Warranty Liability [Line Items]
Bodily Injury Insurance Deductible		$ 250