Consolidated Statements of Comprehensive Income (Loss) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 798,000	$ (2,169,000)	$ 1,391,000	$ (2,365,000)
Other comprehensive income, net of tax:
Pension settlement, net of tax ($880 in 2019)	0	2,049,000	0	2,049,000
Decrease in pension liability, net of tax ($42 in 2020 and $43 in 2019)	90,000	98,000	180,000	252,000
Other comprehensive income	90,000	2,147,000	180,000	2,301,000
Total comprehensive income (loss)	$ 888,000	$ (22,000)	$ 1,571,000	$ (64,000)