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Earnings Per Share Schedule of Earnings Per Common Share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Weighted average number of common shares outstanding        
Basic (in shares) 2,762 2,750 2,759 2,750
Dilutive effect of stock options and RSUs (in shares) 27 0 0 0
Weighted average common shares outstanding - diluted (in shares) 2,789 2,750 2,759 2,750