Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	May 31, 2020	May 31, 2019
EPS:
Net income	$ 1,755	$ 2,598	$ 1,917	$ 2,944	$ 1,961	$ 1,925	$ 6,270	$ 6,830
Less: accrued preferred stock dividends	(19)			(19)			(57)	(57)
Net income attributable to common shareholders	$ 1,736			$ 2,925			$ 6,213	$ 6,773
Earnings per common share - basic and diluted	$ 0.36			$ 0.60			$ 1.28	$ 1.39