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Net Income per Common Share - Textuals (Details) - shares
3 Months Ended 9 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Net Income per Common Share        
Common stock excluded from the diluted net income per share calculation 846,200 344,000 680,700 330,000