Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017
EPS:
Net income	$ 2,253	$ 1,278	$ 4,767	$ 2,686
Less: accrued preferred stock dividends	(19)	(19)	(57)	(57)
Net income available for common shareholders	$ 2,234	$ 1,259	$ 4,710	$ 2,629
Earnings per common share - basic and diluted	$ 0.46	$ 0.26	$ 0.97	$ 0.54