Note 7 - Property, Plant and Equipment (Tables)

3 Months Ended

Jul. 31, 2023

Notes Tables

Property, Plant and Equipment [Table Text Block]

	July 31, 2023			April 30, 2023
Land	$	4,751		$	4,751
Building and improvements		47,867			47,867
Aircraft		7,193			8,515
Machinery and equipment		5,627			5,547
Office furniture and fixtures		14,054			13,881
Leasehold improvements		4,032			4,032
		83,524			84,593
Accumulated depreciation		(25,189	)		(25,526	)
Total property, plant and equipment	$	58,335		$	59,067

Schedule of Useful Life of Property, Plant, and Equipment [Table Text Block]

Description	Estimated useful life
Building and improvements	39 years or the shorter of the estimated useful life of the asset or the underlying lease term
Aircraft	5 years
Machinery and equipment	5 years
Office furniture and fixtures	5 years
Leasehold improvements	Shorter of the estimated useful life of the asset or the underlying lease term