Earnings per Share Data - Basic and Diluted Earnings Per Share (Detail) - USD ($)	3 Months Ended						9 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net Income (Loss)	$ 2,558,000	$ 6,222,000	$ 4,326,000	$ 3,212,000	$ 4,873,000	$ 3,476,000	$ 13,106,000	$ 11,561,000
Common Shares:
Weighted average common shares outstanding: Basic	14,658,000			14,658,000			14,658,000	14,658,000
Weighted average common shares outstanding: Diluted	14,658,000			14,658,000			14,658,000	14,658,000
Net income per common share – basic	$ 0.17			$ 0.22			$ 0.89	$ 0.79
Net income per common share – diluted	$ 0.17			$ 0.22			$ 0.89	$ 0.79