Consolidated Statements of Shareholders' Equity (Unaudited) - 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, 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 loss				(918,000)		(918,000)
Unrealized gains (losses) on investments, net					35,316,000	35,316,000
Reclassification adjustment of other-than-temporary impairment losses recognized in net income (net of taxes)
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 loss				8,201,000		8,201,000
Unrealized gains (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
Reclassification adjustment of other-than-temporary impairment losses recognized in net income (net of taxes)					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
Net loss				(25,216,000)		(25,216,000)
Unrealized gains (losses) on investments, net
Reclassification adjustment of other-than-temporary impairment losses recognized in net income (net of taxes)
Adoption of new accounting pronouncement at Sep. 30, 2018				115,786,000	(115,786,000)
Balance (in shares) at Sep. 30, 2019	1,805,053	(424,307)
Balance at Sep. 30, 2019	$ 18,000	$ (4,000)	$ 1,755,000	$ 135,931,000		$ 137,700,000