Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Beginning balance, value at Sep. 30, 2017	$ 97	$ 63,453	$ 69,195			$ 2,480	$ 135,225
Beginning balance, shares at Sep. 30, 2017	9,719,000
Payment of dividends			(1,168)				(1,168)
Payments to noncontrolling interest						(180)	(180)
Equity impact of additional investment in TEZ		759				(2,484)	(1,725)
Change in marketable securities				220			220
Net loss			20,879			81	20,960
Ending balance, value at Sep. 30, 2018	$ 97	64,212	88,906	220		(103)	153,332
Ending balance, shares at Sep. 30, 2018	9,719,000
Net loss							7,523
Ending balance, value at Dec. 31, 2018							160,209
Beginning balance, value at Sep. 30, 2018	$ 97	64,212	88,906	220		(103)	153,332
Beginning balance, shares at Sep. 30, 2018	9,719,000
Payment of dividends			(1,252)				(1,252)
Payments to noncontrolling interest						(70)	(70)
Reclassification upon adoption of ASU 2016-01			220	(220)
Purchase of treasury shares					$ (2,901)		(2,901)
Purchase of treasury shares					(128,000)
Canceled treasury shares	$ (1)	(2,900)			$ 2,901
Canceled treasury shares, shares	(128,000)				128,000
Divestiture in other entities						(134)	(134)
Net loss			20,294			151	20,445
Ending balance, value at Sep. 30, 2019	$ 96	61,312	108,168			(156)	169,420
Ending balance, shares at Sep. 30, 2019	9,591,000
Payment of dividends			(1,286)				(1,286)
Payments to noncontrolling interest						(31)	(31)
Purchase of treasury shares					$ (9,484)		(9,484)
Purchase of treasury shares					(516,000)
Canceled treasury shares	$ (5)	(9,479)			$ 9,484
Canceled treasury shares, shares	(516,000)				516,000
Net loss			(6,085)			(227)	(6,312)
Ending balance, value at Sep. 30, 2020	$ 91	$ 51,833	$ 100,797			$ (414)	$ 152,307
Ending balance, shares at Sep. 30, 2020	9,075,000