CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Current assets:
Cash and cash equivalents	$ 11,393	$ 16,281
Certificates of deposit	5,195	4,413
Accounts and other receivables, net of allowance for doubtful accounts of: $35,000 at March 31, 2018; $46,000 at September 30, 2017	1,528	1,414
Income taxes receivable	2,208	1,145
Investment held for sale	1,000	1,037
Other current assets	1,463	852
Total current assets	22,787	25,142
Income taxes receivable, net of current portion	460	0
Deferred income tax assets	0	300
Investments	1,976	2,209
Property and equipment	60,262	79,231
Accumulated depletion, depreciation, and amortization	(56,201)	(73,862)
Property and equipment, net	4,061	5,369
Total assets	29,284	33,020
Current liabilities:
Accounts payable	1,300	1,185
Accrued capital expenditures	252	348
Accrued operating and other expenses	865	1,386
Accrued compensation	396	390
Current portion of asset retirement obligation	1,223	1,231
Other current liabilities	105	258
Total current liabilities	4,141	4,798
Deferred rent	64	21
Liability for retirement benefits	4,026	4,150
Asset retirement obligation	3,412	5,632
Deferred income tax liabilities	458	236
Total liabilities	12,101	14,837
Commitments and contingencies
Equity:
Common stock, par value $0.50 per share; authorized, 20,000,000 shares: 8,445,060 issued at March 31, 2018 and September 30, 2017	4,223	4,223
Additional paid-in capital	1,351	1,350
Retained earnings	14,685	15,023
Accumulated other comprehensive loss, net	(1,182)	(1,058)
Treasury stock, at cost: 167,900 shares at March 31, 2018 and September 30, 2017	(2,286)	(2,286)
Total stockholders' equity	16,791	17,252
Non-controlling interests	392	931
Total equity	17,183	18,183
Total liabilities and equity	$ 29,284	$ 33,020