CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 15,862,000	$ 7,392,000
Other comprehensive income, net of tax:
Decrease in pension liability	75,000	2,655,000
Income tax effect	(25,000)	(811,000)
Decrease in pension liability, net of tax	50,000	1,844,000
Other comprehensive income	50,000	1,844,000
Total comprehensive income	$ 15,912,000	$ 9,236,000