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Earnings Per Share Schedule of Earnings Per Common Share (Details) - shares
shares in Thousands
3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Weighted average number of common shares outstanding:    
Basic (in shares) 2,756 2,750
Dilutive effect of stock options and RSUs (in shares) 0 21
Weighted average common shares outstanding-diluted (in shares) 2,756 2,771