CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Current assets:
Cash and cash equivalents	$ 16,124	$ 15,550
Certificates of deposit	2,480	0
Restricted cash	0	381
Accounts and other receivables, net of allowance for doubtful accounts of: $52,000 at June 30, 2017; $40,000 at September 30, 2016	1,766	1,228
Income taxes receivable	989	378
Asset held for sale	0	1,829
Investment held for sale	1,192	1,192
Other current assets	916	556
Total current assets	23,467	21,114
Investments	2,861	3,552
Property and equipment	75,938	76,868
Accumulated depletion, depreciation, and amortization	(71,288)	(69,966)
Property and equipment, net	4,650	6,902
Total assets	30,978	31,568
Current liabilities:
Accounts payable	1,160	1,423
Accrued capital expenditures	241	439
Accrued operating and other expenses	1,042	1,031
Accrued compensation	495	449
Current portion of asset retirement obligation	1,040	1,017
Other current liabilities	446	377
Total current liabilities	4,424	4,736
Liability for retirement benefits	6,508	6,707
Asset retirement obligation	5,319	6,177
Deferred income taxes	267	204
Total liabilities	16,518	17,824
Commitments and contingencies (Note 13)
Equity:
Common stock, par value $0.50 per share; authorized, 20,000,000 shares: 8,445,060 issued at June 30, 2017 and September 30, 2016	4,223	4,223
Additional paid-in capital	1,349	1,345
Retained earnings	14,366	13,852
Accumulated other comprehensive loss, net	(3,643)	(3,920)
Treasury stock, at cost: 167,900 shares at June 30, 2017 and September 30, 2016	(2,286)	(2,286)
Total stockholders' equity	14,009	13,214
Non-controlling interests	451	530
Total equity	14,460	13,744
Total liabilities and equity	$ 30,978	$ 31,568