Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Aug. 31, 2023	Aug. 31, 2022
EPS:
Net income	$ 21,185	$ 21,308
Less: cumulative preferred stock dividend	(76)	(76)
Net income attributable to common shareholders for basic and diluted EPS computation	$ 21,109	$ 21,232
Weighted average common shares outstanding for basic EPS computation	4,861,590	4,861,590
Weighted average common shares outstanding for diluted EPS computation	4,861,590	4,861,590
Earnings per common share - basic	$ 4.34	$ 4.37
Earnings per common share - diluted	$ 4.34	$ 4.37