Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Feb. 28, 2023	Nov. 30, 2022	Feb. 28, 2022	Nov. 30, 2021	Feb. 28, 2023	Feb. 28, 2022
EPS:
Net income	$ 5,100	$ 4,711	$ 3,407	$ 6,786	$ 9,811	$ 10,193
Less: accrued preferred stock dividends	(19)		(19)		(38)	(38)
Net income available for common shareholders	$ 5,081		$ 3,388		$ 9,773	$ 10,155
Earnings per common share - basic	$ 1.05		$ 0.70		$ 2.01	$ 2.09
Earnings per common share - diluted	$ 1.05		$ 0.70		$ 2.01	$ 2.09