CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 1,637,000	$ 593,000
Other comprehensive income, net of tax:
Decrease in pension liability, net of tax ($31 in 2022 and $42 in 2021)	66,000	90,000
Other comprehensive income	66,000	90,000
Total comprehensive income	$ 1,703,000	$ 683,000