Consolidated Statements of Shareholders' Equity - USD ($)	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Sep. 30, 2015	1,805,053	(424,307)
Balance at Sep. 30, 2015	$ 18,000	$ (4,000)	$ 1,755,000	$ 59,111,000	$ 67,720,000	$ 128,600,000
Net income (loss)				(1,043,000)		(1,043,000)
Unrealized losses on investments, net					(2,214,000)	(2,214,000)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax, Total
Balance (in shares) at Sep. 30, 2016	1,805,053	(424,307)
Balance at Sep. 30, 2016	$ 18,000	$ (4,000)	1,755,000	58,068,000	65,506,000	125,343,000
Net income (loss)				(918,000)		(918,000)
Unrealized losses on investments, net					35,316,000	35,316,000
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax, Total
Balance (in shares) at Sep. 30, 2017	1,805,053	(424,307)
Balance at Sep. 30, 2017	$ 18,000	$ (4,000)	1,755,000	57,150,000	100,822,000	159,741,000
Net income (loss)				8,201,000		8,201,000
Unrealized losses on investments, net					(5,823,000)	(5,823,000)
Sale of bond investments (net of taxes)					(2,553,000)	(2,553,000)
Reclassification of stranded tax effects				(19,990,000)	19,990,000
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax, Total					3,350,000	3,350,000
Balance (in shares) at Sep. 30, 2018	1,805,053	(424,307)
Balance at Sep. 30, 2018	$ 18,000	$ (4,000)	$ 1,755,000	$ 45,361,000	$ 115,786,000	$ 162,916,000