CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Noncontrolling Interests
Beginning balance (in shares) at Sep. 30, 2020		9,074,569			0
Beginning balance at Sep. 30, 2020	$ 152,307	$ 91	$ 51,833	$ 100,797	$ 0	$ (414)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of treasury shares (in shares)					(74,659)
Purchase of treasury shares	(1,794)				$ (1,794)
Canceled treasury shares (in shares)		(74,659)			(74,659)
Canceled treasury shares	0	$ (1)	(1,793)		$ (1,794)
Payment of dividends	(360)			(360)
Net income (loss)	9,509			9,643		(134)
Ending balance (in shares) at Dec. 31, 2020		8,999,910			0
Ending balance at Dec. 31, 2020	159,662	$ 90	50,040	110,080	$ 0	(548)
Beginning balance (in shares) at Sep. 30, 2020		9,074,569			0
Beginning balance at Sep. 30, 2020	152,307	$ 91	51,833	100,797	$ 0	(414)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	15,541
Ending balance (in shares) at Mar. 31, 2021		8,999,910			0
Ending balance at Mar. 31, 2021	165,334	$ 90	50,040	115,811	$ 0	(607)
Beginning balance (in shares) at Dec. 31, 2020		8,999,910			0
Beginning balance at Dec. 31, 2020	159,662	$ 90	50,040	110,080	$ 0	(548)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment of dividends	(360)			(360)
Net income (loss)	6,032			6,091		(59)
Ending balance (in shares) at Mar. 31, 2021		8,999,910			0
Ending balance at Mar. 31, 2021	165,334	$ 90	50,040	115,811	$ 0	(607)
Beginning balance (in shares) at Sep. 30, 2021		8,999,910			0
Beginning balance at Sep. 30, 2021	179,223	$ 90	50,040	129,693	$ 0	(600)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares (in shares)		500,000
Issuance of common shares	30,362	$ 5	30,357
Payment of dividends	(380)			(380)
Net income (loss)	10,564			10,575		(11)
Ending balance (in shares) at Dec. 31, 2021		9,499,910			0
Ending balance at Dec. 31, 2021	219,769	$ 95	80,397	139,888	$ 0	(611)
Beginning balance (in shares) at Sep. 30, 2021		8,999,910			0
Beginning balance at Sep. 30, 2021	179,223	$ 90	50,040	129,693	$ 0	(600)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	21,537
Ending balance (in shares) at Mar. 31, 2022		9,454,267			0
Ending balance at Mar. 31, 2022	227,423	$ 94	77,553	150,366	$ 0	(590)
Beginning balance (in shares) at Dec. 31, 2021		9,499,910			0
Beginning balance at Dec. 31, 2021	219,769	$ 95	80,397	139,888	$ 0	(611)
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
Ending balance (in shares) at Mar. 31, 2022		9,454,267			0
Ending balance at Mar. 31, 2022	$ 227,423	$ 94	$ 77,553	$ 150,366	$ 0	$ (590)