Note 7 - Property, Plant, and Equipment - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Oct. 31, 2024	Apr. 30, 2024
Property, plant, and equipment, gross	$ 86,400	$ 83,918
Accumulated depreciation	(26,097)	(24,331)
Total property, plant and equipment	60,303	59,587
Land [Member]
Property, plant, and equipment, gross	3,447	4,224
Building and Building Improvements [Member]
Property, plant, and equipment, gross	48,371	48,190
Aircraft [Member]
Property, plant, and equipment, gross	8,122	5,599
Machinery and Equipment [Member]
Property, plant, and equipment, gross	7,541	7,484
Furniture and Fixtures [Member]
Property, plant, and equipment, gross	14,887	14,389
Leasehold Improvements [Member]
Property, plant, and equipment, gross	$ 4,032	$ 4,032