Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Feb. 29, 2020	Nov. 30, 2019	Feb. 28, 2019	Nov. 30, 2018	Feb. 29, 2020	Feb. 28, 2019
EPS:
Net income	$ 2,598	$ 1,917	$ 1,961	$ 1,925	$ 4,515	$ 3,886
Less: accrued preferred stock dividends	(19)		(19)		(38)	(38)
Net income attributable to common shareholders	$ 2,579		$ 1,942		$ 4,477	$ 3,848
Earnings per common share - basic and diluted	$ 0.53		$ 0.40		$ 0.92	$ 0.79