Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	May 31, 2021	Feb. 28, 2021	Nov. 30, 2020	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	May 31, 2021	May 31, 2020
EPS:
Net income	$ 3,080	$ 1,394	$ 851	$ 1,755	$ 2,598	$ 1,917	$ 5,325	$ 6,270
Less: accrued preferred stock dividends	(19)			(19)			(57)	(57)
Net income attributable to common shareholders	$ 3,061			$ 1,736			$ 5,268	$ 6,213
Earnings per common share - basic and diluted	$ 0.63			$ 0.36			$ 1.08	$ 1.28