CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net (loss) earnings	$ (1,418,000)	$ 2,314,000
Adjustments to reconcile net (loss) earnings to net cash used in operating activities:
Equity in income of affiliates	(223,000)	(2,276,000)
Depletion, depreciation, and amortization	1,111,000	1,203,000
Impairment of assets	202,000	155,000
Gain on sale of asset	0	(527,000)
Gain on sale of oil and natural gas properties	(2,255,000)	0
Sale of interest in leasehold land, net of fees paid	(1,107,000)	(4,198,000)
Distributions of income from equity investees	223,000	2,284,000
Retirement benefits expense	295,000	537,000
Income tax receivable, noncurrent	(429,000)	0
Accretion of asset retirement obligation	297,000	433,000
Deferred income tax provision (benefit)	381,000	(268,000)
Asset retirement obligation payments	(624,000)	(833,000)
Share-based compensation (benefit) expense	(59,000)	15,000
Deferred rent liability	86,000	21,000
Retirement plan contributions and payments	(217,000)	(365,000)
Decrease from changes in current assets and liabilities	(1,354,000)	(614,000)
Net cash used in operating activities	(5,091,000)	(2,119,000)
Cash flows from investing activities:
Purchases of certificates of deposit	(3,958,000)	(7,139,000)
Proceeds from the maturity of certificates of deposit	7,630,000	2,726,000
Distributions from equity investees in excess of earnings	601,000	1,335,000
Proceeds from sale of interest in leasehold land, net of fees paid	1,107,000	4,198,000
Proceeds from the sale of assets, net of closing costs	0	2,360,000
Proceeds from sale of oil and natural gas assets	848,000	619,000
Proceeds from the sale of investment in residential parcel	1,000,000	0
Payments to acquire oil and natural gas properties	(10,362,000)	(381,000)
Capital expenditures	(750,000)	(807,000)
Net cash (used in) provided by investing activities	(3,884,000)	2,911,000
Cash flows from financing activities:
Decrease in restricted cash	0	372,000
Contributions from non-controlling interests	0	6,000
Distributions to non-controlling interests	(1,070,000)	(748,000)
Net cash used in financing activities	(1,070,000)	(370,000)
Effect of exchange rate changes on cash and cash equivalents	(271,000)	309,000
Net (decrease) increase in cash and cash equivalents	(10,316,000)	731,000
Cash and cash equivalents at beginning of year	16,281,000	15,550,000
Cash and cash equivalents at end of year	$ 5,965,000	$ 16,281,000