Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Feb. 28, 2021	Nov. 30, 2020	Feb. 29, 2020	Nov. 30, 2019	Feb. 28, 2021	Feb. 29, 2020
EPS:
Net income	$ 1,394	$ 851	$ 2,598	$ 1,917	$ 2,245	$ 4,515
Less: cumulative preferred stock dividend	(19)		(19)		(38)	(38)
Net income attributable to common shareholders	$ 1,375		$ 2,579		$ 2,207	$ 4,477
Earnings per common share - basic and diluted	$ 0.28		$ 0.53		$ 0.45	$ 0.92