Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
EPS:
Net income	$ 1,319	$ 748	$ 2,514	$ 1,408
Less: undeclared cumulative preferred stock dividends	(19)	(19)	(38)	(38)
Net income available for common shareholders	$ 1,300	$ 729	$ 2,476	$ 1,370
Earnings per common share - basic and diluted	$ 0.27	$ 0.15	$ 0.51	$ 0.28