Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	May 31, 2022	Feb. 28, 2022	Nov. 30, 2021	May 31, 2021	Feb. 28, 2021	Nov. 30, 2020	May 31, 2022	May 31, 2021
EPS:
Net income	$ 5,330	$ 3,407	$ 6,786	$ 3,080	$ 1,394	$ 851	$ 15,523	$ 5,325
Less: accrued preferred stock dividends	(19)			(19)			(57)	(57)
Net income attributable to common shareholders	$ 5,311			$ 3,061			$ 15,466	$ 5,268
Earnings per common share - basic	$ 1.09			$ 0.63			$ 3.18	$ 1.08
Earnings per common share - diluted	$ 1.09			$ 0.63			$ 3.18	$ 1.08