CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 3,326	$ 798	$ 4,963	$ 1,391
Other comprehensive income, net of tax:
Decrease in pension liability	98	132	195	264
Income tax effect	(31)	(42)	(62)	(84)
Decrease in pension liability, net of tax	67	90	133	180
Other comprehensive income	67	90	133	180
Total comprehensive income	$ 3,393	$ 888	$ 5,096	$ 1,571