CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents	$ 5,035	$ 5,965
Certificates of deposit	0	741
Accounts and other receivables, net of allowance for doubtful accounts of: $41,000 at June 30, 2019; $42,000 at September 30, 2018	1,997	1,965
Income taxes receivable	166	2,461
Other current assets	2,138	950
Total current assets	9,336	12,082
Income taxes receivable, net of current portion	460	429
Asset for retirement benefits	1,029	848
Investments	711	1,608
Property and equipment	73,781	73,010
Accumulated depletion, depreciation, and amortization	(60,749)	(56,599)
Property and equipment, net	13,032	16,411
Total assets	24,568	31,378
Current liabilities:
Accounts payable	1,214	1,191
Accrued capital expenditures	135	232
Accrued compensation	238	568
Accrued operating and other expenses	1,257	1,140
Current portion of asset retirement obligation	470	444
Other current liabilities	1,687	54
Total current liabilities	5,001	3,629
Deferred rent	172	107
Liability for retirement benefits	4,559	4,410
Asset retirement obligation	6,783	6,678
Deferred income tax liabilities	178	315
Total liabilities	16,693	15,139
Commitments and contingencies
Equity:
Common stock, par value $0.50 per share; authorized, 20,000,000 shares: 8,445,060 issued at June 30, 2019 and September 30, 2018	4,223	4,223
Additional paid-in capital	1,350	1,350
Retained earnings	5,183	13,253
Accumulated other comprehensive loss, net	(666)	(514)
Treasury stock, at cost: 167,900 shares at June 30, 2019 and September 30, 2018	(2,286)	(2,286)
Total stockholders' equity	7,804	16,026
Non-controlling interests	71	213
Total equity	7,875	16,239
Total liabilities and equity	$ 24,568	$ 31,378