Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Feb. 28, 2022	Nov. 30, 2021	Feb. 28, 2021	Nov. 30, 2020	Feb. 28, 2022	Feb. 28, 2021
EPS:
Net income	$ 3,407	$ 6,786	$ 1,394	$ 851	$ 10,193	$ 2,245
Less: accrued preferred stock dividends	(19)		(19)		(38)	(38)
Net income attributable to common shareholders	$ 3,388		$ 1,375		$ 10,155	$ 2,207
Earnings per common share - basic	$ 0.70		$ 0.28		$ 2.09	$ 0.45
Earnings per common share - diluted	$ 0.70		$ 0.28		$ 2.09	$ 0.45