Earnings Per Share Schedule of Earnings Per Common Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Weighted average number of common shares outstanding
Basic (in shares)	2,790	2,762	2,785	2,759
Dilutive effect of stock options and RSUs (in shares)	0	27	0	0
Weighted average common shares outstanding - diluted (in shares)	2,790	2,789	2,785	2,759