CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Noncontrolling Interests
Common Stock, Beginning balance (in shares) at Sep. 30, 2021		8,999,910
Beginning balance at Sep. 30, 2021	$ 179,223	$ 90	$ 50,040	$ 129,693	$ 0	$ (600)
Treasury Stock, Beginning balance (in shares) at Sep. 30, 2021					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares for business combination (in shares)		500,000
Issuance of common shares for business combination	30,362	$ 5	30,357
Payment of dividends	(380)			(380)
Net income (loss)	10,564			10,575		(11)
Common Stock, Ending balance (in shares) at Dec. 31, 2021		9,499,910
Ending balance at Dec. 31, 2021	219,769	$ 95	80,397	139,888	$ 0	(611)
Treasury Stock, Ending balance (in shares) at Dec. 31, 2021					0
Common Stock, Beginning balance (in shares) at Sep. 30, 2021		8,999,910
Beginning balance at Sep. 30, 2021	179,223	$ 90	50,040	129,693	$ 0	(600)
Treasury Stock, Beginning balance (in shares) at Sep. 30, 2021					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	35,479
Common Stock, Ending balance (in shares) at Jun. 30, 2022		9,286,198
Ending balance at Jun. 30, 2022	231,685	$ 93	68,342	163,800	$ 0	(550)
Treasury Stock, Ending balance (in shares) at Jun. 30, 2022					0
Common Stock, Beginning balance (in shares) at Dec. 31, 2021		9,499,910
Beginning balance at Dec. 31, 2021	219,769	$ 95	80,397	139,888	$ 0	(611)
Treasury Stock, Beginning balance (in shares) at Dec. 31, 2021					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of treasury shares (in shares)					(45,643)
Purchase of treasury shares	(2,845)				$ (2,845)
Canceled treasury shares (in shares)		(45,643)			(45,643)
Canceled treasury shares	0	$ (1)	(2,844)		$ 2,845
Payment of dividends	(474)			(474)
Net income (loss)	10,973			10,952		21
Common Stock, Ending balance (in shares) at Mar. 31, 2022		9,454,267
Ending balance at Mar. 31, 2022	227,423	$ 94	77,553	150,366	$ 0	(590)
Treasury Stock, Ending balance (in shares) at Mar. 31, 2022					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of treasury shares (in shares)					(168,069)
Purchase of treasury shares	(9,212)				$ (9,212)
Canceled treasury shares (in shares)		(168,069)			(168,069)
Canceled treasury shares	0	$ (1)	(9,211)		$ 9,212
Payment of dividends	(468)			(468)
Net income (loss)	13,942			13,902		40
Common Stock, Ending balance (in shares) at Jun. 30, 2022		9,286,198
Ending balance at Jun. 30, 2022	$ 231,685	$ 93	68,342	163,800	$ 0	(550)
Treasury Stock, Ending balance (in shares) at Jun. 30, 2022					0
Common Stock, Beginning balance (in shares) at Sep. 30, 2022	9,231,725	9,231,725
Beginning balance at Sep. 30, 2022	$ 241,758	$ 92	67,227	173,950	$ 0	489
Treasury Stock, Beginning balance (in shares) at Sep. 30, 2022					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of treasury shares (in shares)					(1,500)
Purchase of treasury shares	(98)				$ (98)
Canceled treasury shares (in shares)		(1,500)			(1,500)
Canceled treasury shares	0		(98)		$ 98
Payment of dividends	(462)			(462)
Stock-based compensation	941		941
Share in return of investment by noncontrolling partner	(600)					(600)
Net income (loss)	10,271			10,238		33
Common Stock, Ending balance (in shares) at Dec. 31, 2022		9,230,225
Ending balance at Dec. 31, 2022	$ 251,810	$ 92	68,070	183,726	$ 0	(78)
Treasury Stock, Ending balance (in shares) at Dec. 31, 2022					0
Common Stock, Beginning balance (in shares) at Sep. 30, 2022	9,231,725	9,231,725
Beginning balance at Sep. 30, 2022	$ 241,758	$ 92	67,227	173,950	$ 0	489
Treasury Stock, Beginning balance (in shares) at Sep. 30, 2022					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 26,981
Common Stock, Ending balance (in shares) at Jun. 30, 2023	9,430,225	9,430,225
Ending balance at Jun. 30, 2023	$ 281,425	$ 94	82,091	199,425	$ 0	(185)
Treasury Stock, Ending balance (in shares) at Jun. 30, 2023					0
Common Stock, Beginning balance (in shares) at Dec. 31, 2022		9,230,225
Beginning balance at Dec. 31, 2022	251,810	$ 92	68,070	183,726	$ 0	(78)
Treasury Stock, Beginning balance (in shares) at Dec. 31, 2022					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares for business combination (in shares)		200,000
Issuance of common shares for business combination	16,308	$ 2	16,306
Payment of dividends	(553)			(553)
Stock-based compensation	706		706
Net income (loss)	7,693			7,732		(39)
Common Stock, Ending balance (in shares) at Mar. 31, 2023		9,430,225
Ending balance at Mar. 31, 2023	275,964	$ 94	85,082	190,905	$ 0	(117)
Treasury Stock, Ending balance (in shares) at Mar. 31, 2023					0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment in fair value of common shares issued for business combination	(3,461)		(3,461)
Payment of dividends	(565)			(565)
Stock-based compensation	470		470
Net income (loss)	$ 9,017			9,085		(68)
Common Stock, Ending balance (in shares) at Jun. 30, 2023	9,430,225	9,430,225
Ending balance at Jun. 30, 2023	$ 281,425	$ 94	$ 82,091	$ 199,425	$ 0	$ (185)
Treasury Stock, Ending balance (in shares) at Jun. 30, 2023					0