Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Net income (loss)	$ (2,851)	$ 174	$ (1,125)	$ 916
Other comprehensive income (loss), net of tax:
Decrease in pension liability, net of tax ($296 in 2018 and $456 in 2017)	225	248	674	746
Other comprehensive income (loss)	225	248	674	746
Total comprehensive income (loss)	$ (2,626)	$ 422	$ (451)	$ 1,662