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, 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) income				14,739,000		14,739,000
Unrealized gains on investments, net					12,118,000	12,118,000
Balance (in shares) at Dec. 31, 2017	1,805,053	(424,307)
Balance at Dec. 31, 2017	$ 18,000	$ (4,000)	1,755,000	71,889,000	112,940,000	186,598,000
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) income				(21,533,000)		(21,533,000)
Unrealized gains on investments, net
Balance (in shares) at Dec. 31, 2018	1,805,053	(424,307)
Balance at Dec. 31, 2018	$ 18,000	$ (4,000)	1,755,000	139,614,000		141,383,000
Adoption of new accounting pronouncement				$ 115,786,000	$ (115,786,000)