Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Feb. 28, 2019	Nov. 30, 2018	Feb. 28, 2018	Nov. 30, 2017	Feb. 28, 2019	Feb. 28, 2018
EPS:
Net income	$ 1,961	$ 1,925	$ 1,319	$ 1,195	$ 3,886	$ 2,514
Less: accrued preferred stock dividends	(19)		(19)		(38)	(38)
Net income attributable to common shareholders	$ 1,942		$ 1,300		$ 3,848	$ 2,476
Earnings per common share - basic and diluted	$ 0.40		$ 0.27		$ 0.79	$ 0.51