Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 593	$ (196)
Other comprehensive income, net of tax:
Decrease in pension liability, net of tax ($42 in 2020 and $67 in 2019)	90	154
Other comprehensive income	90	154
Total comprehensive income (loss)	$ 683	$ (42)