CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)	Mar. 31, 2017	Sep. 30, 2016
Current assets:
Cash and cash equivalents	$ 16,655,000	$ 15,550,000
Restricted cash	375,000	381,000
Accounts and other receivables, net of allowance for doubtful accounts of: $56,000 at March 31, 2017; $40,000 at September 30, 2016	1,362,000	1,228,000
Asset held for sale	1,829,000	1,829,000
Investment held for sale	1,192,000	1,192,000
Other current assets	1,629,000	934,000
Total current assets	23,042,000	21,114,000
Investments	2,892,000	3,552,000
Property and equipment	76,104,000	76,868,000
Accumulated depletion, depreciation, and amortization	(69,663,000)	(69,966,000)
Property and equipment, net	6,441,000	6,902,000
Total assets	32,375,000	31,568,000
Current liabilities:
Accounts payable	1,789,000	1,423,000
Accrued capital expenditures	250,000	439,000
Accrued operating and other expenses	982,000	1,031,000
Accrued compensation	592,000	449,000
Current portion of asset retirement obligation	1,007,000	1,017,000
Other current liabilities	348,000	377,000
Total current liabilities	4,968,000	4,736,000
Liability for retirement benefits	6,504,000	6,707,000
Asset retirement obligation	5,749,000	6,177,000
Deferred income taxes	318,000	204,000
Total liabilities	17,539,000	17,824,000
Commitments and contingencies (Note 12)
Equity:
Common stock, par value $0.50 per share; authorized, 20,000,000 shares: 8,445,060 issued at March 31, 2017 and September 30, 2016	4,223,000	4,223,000
Additional paid-in capital	1,348,000	1,345,000
Retained earnings	14,878,000	13,852,000
Accumulated other comprehensive loss, net	(3,775,000)	(3,920,000)
Treasury stock, at cost: 167,900 shares at March 31, 2017 and September 30, 2016	(2,286,000)	(2,286,000)
Total stockholders' equity	14,388,000	13,214,000
Non-controlling interests	448,000	530,000
Total equity	14,836,000	13,744,000
Total liabilities and equity	$ 32,375,000	$ 31,568,000