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Earnings Per Share Schedule of Earnings Per Common Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Weighted average number of common shares outstanding        
Basic 2,759 2,750 2,757 2,750
Dilutive effect of stock options and RSUs 0 0 0 0
Weighted average common shares outstanding - diluted 2,759 2,750 2,757 2,750