CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Current assets:
Cash and cash equivalents	$ 15,360	$ 15,550
Restricted cash	372	381
Accounts and other receivables, net of allowance for doubtful accounts of: $56,000 at December 31, 2016; $40,000 at September 30, 2016	2,121	1,228
Asset held for sale	1,829	1,829
Investment held for sale	1,192	1,192
Other current assets	1,316	934
Total current assets	22,190	21,114
Investments	5,381	3,552
Property and equipment	75,599	76,868
Accumulated depletion, depreciation, and amortization	(68,846)	(69,966)
Property and equipment, net	6,753	6,902
Total assets	34,324	31,568
Current liabilities:
Accounts payable	1,448	1,423
Accrued capital expenditures	335	439
Accrued compensation	734	449
Accrued operating and other expenses	1,215	1,031
Current portion of asset retirement obligation	1,119	1,017
Other current liabilities	601	377
Total current liabilities	5,452	4,736
Liability for retirement benefits	6,784	6,707
Asset retirement obligation	5,838	6,177
Deferred income taxes	329	204
Total liabilities	18,403	17,824
Commitments and contingencies (Note 12)
Equity:
Common stock, par value $0.50 per share; authorized, 20,000,000 shares: 8,445,060 issued at December 31, 2016 and September 30, 2016	4,223	4,223
Additional paid-in capital	1,347	1,345
Retained earnings	15,493	13,852
Accumulated other comprehensive loss, net	(3,893)	(3,920)
Treasury stock, at cost: 167,900 shares at December 31, 2016 and September 30, 2016	(2,286)	(2,286)
Total stockholders' equity	14,884	13,214
Non-controlling interests	1,037	530
Total equity	15,921	13,744
Total liabilities and equity	$ 34,324	$ 31,568