Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Net income	$ 55	$ 278	$ 116	$ 1,726
Other comprehensive income, net of tax:
Decrease in pension liability, net of tax	157	225	314	450
Other comprehensive income	157	225	314	450
Total comprehensive income	$ 212	$ 503	$ 430	$ 2,176