CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities:
Net (losses) earnings	$ (482)	$ 2,513	$ (1,275)
Adjustments to reconcile net (losses) earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	13,599	18,792	23,717
Gains on sale of property	(594)	(1,966)	(535)
Dry hole costs incurred	0	0	817
Impairment of oil and natural gas properties	3	313	12,082
Provision for doubtful accounts	78	19	27
Deferred income taxes	(3,840)	(857)	(4,843)
Net change in fair value contracts	27	(243)	188
Losses from equity investment	0	468	0
Impairment of investments in unconsolidated affiliates	2,500	1,732	0
Loss on deconsolidation of subsidiary (Note 3)	3,505	0	0
Changes in assets and liabilities:
Accounts receivable	(34,935)	(15,368)	72,594
Accounts receivable/payable, affiliates	271	0	0
Inventories	878	(5,399)	5,810
Income tax receivable	1,418	(148)	(1,617)
Prepayments and other current assets	831	492	8,351
Accounts payable	44,790	6,984	(87,404)
Accrued liabilities	(991)	52	(166)
Other	(962)	(440)	(2,269)
Net cash provided by operating activities	26,096	6,944	25,477
Investing activities:
Property and equipment additions	(2,644)	(8,484)	(11,074)
Proceeds from property sales	720	3,706	719
Proceeds from sales of AREC assets	2,775	0	0
Investments in unconsolidated affiliates	0	(4,700)	0
Insurance and state collateral (deposits) refunds	(1,067)	1,710	283
Net cash used in investing activities	(216)	(7,768)	(10,072)
Financing activities:
Principal repayments of capital lease obligations	(118)	0	0
Dividends paid on common stock	(3,711)	(3,711)	(3,712)
Net cash used in financing activities	(3,829)	(3,711)	(3,712)
Increase (decrease) in cash and cash equivalents	22,051	(4,535)	11,693
Cash and cash equivalents at beginning of period	87,342	91,877	80,184
Cash and cash equivalents at end of period	$ 109,393	$ 87,342	$ 91,877