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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Basic and diluted earnings per share:    
Net income $ 6,949 $ 4,051
Less: cumulative preferred stock dividend (76) (76)
Net income attributable to common shareholders for basic and diluted EPS computation $ 6,873 $ 3,975
Weighted average common shares outstanding for basic and diluted EPS computation 4,861,590 4,861,590
Earnings per common share - basic and diluted $ 1.41 $ 0.82