CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Current assets:
Cash and cash equivalents	$ 6,427	$ 5,965
Certificates of deposit	0	741
Accounts and other receivables, net of allowance for doubtful accounts of: $40,000 at March 31, 2019; $42,000 at September 30, 2018	2,066	1,965
Income taxes receivable	102	2,461
Other current assets	2,198	950
Total current assets	10,793	12,082
Income taxes receivable, net of current portion	460	429
Asset for retirement benefits	997	848
Investments	970	1,608
Property and equipment	71,874	73,010
Accumulated depletion, depreciation, and amortization	(58,949)	(56,599)
Property and equipment, net	12,925	16,411
Total assets	26,145	31,378
Current liabilities:
Accounts payable	1,615	1,191
Accrued capital expenditures	121	232
Accrued compensation	246	568
Accrued operating and other expenses	1,057	1,140
Current portion of asset retirement obligation	648	444
Other current liabilities	1,913	54
Total current liabilities	5,600	3,629
Deferred rent	150	107
Liability for retirement benefits	4,515	4,410
Asset retirement obligation	6,500	6,678
Deferred income tax liabilities	205	315
Total liabilities	16,970	15,139
Commitments and contingencies
Equity:
Common stock, par value $0.50 per share; authorized, 20,000,000 shares: 8,445,060 issued at March 31, 2019 and September 30, 2018	4,223	4,223
Additional paid-in capital	1,350	1,350
Retained earnings	6,548	13,253
Accumulated other comprehensive loss, net	(764)	(514)
Treasury stock, at cost: 167,900 shares at March 31, 2019 and September 30, 2018	(2,286)	(2,286)
Total stockholders' equity	9,071	16,026
Non-controlling interests	104	213
Total equity	9,175	16,239
Total liabilities and equity	$ 26,145	$ 31,378