CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net (losses) earnings	$ 2,945	$ (482)	$ 2,513
Adjustments to reconcile net (losses) earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	10,654	13,599	18,792
Gains on sale of property	(1,240)	(594)	(1,966)
Impairment of oil and natural gas properties	0	3	313
Provision for doubtful accounts	(150)	78	19
Share-based compensation expense	255	0	0
Deferred income taxes	936	(3,840)	(857)
Net change in fair value contracts	(2)	27	(243)
Losses from equity investment	0	0	468
Impairment of investments in unconsolidated affiliates	0	2,500	1,732
Loss on deconsolidation of subsidiary (Note 4)	0	3,505	0
Changes in assets and liabilities:
Accounts receivable	36,350	(34,935)	(15,368)
Accounts receivable/payable, affiliates	24	271	0
Inventories	(10,587)	878	(5,399)
Income tax receivable	(1,087)	1,418	(148)
Prepayments and other current assets	(293)	831	492
Accounts payable	(10,252)	44,790	6,984
Accrued liabilities	1,744	(991)	52
Other	1,717	(962)	(440)
Net cash provided by operating activities	31,014	26,096	6,944
Investing activities:
Property and equipment additions	(11,731)	(2,644)	(8,484)
Asset acquisition	(10,272)	0	0
Proceeds from property sales	2,038	720	3,706
Proceeds from sales of AREC assets	0	2,775	0
Investments in unconsolidated affiliates	0	0	(4,700)
Insurance and state collateral (deposits) refunds	830	(1,067)	1,710
Net cash used in investing activities	(19,135)	(216)	(7,768)
Financing activities:
Principal repayments of capital lease obligations	(495)	(118)	0
Dividends paid on common stock	(3,711)	(3,711)	(3,711)
Net cash used in financing activities	(4,206)	(3,829)	(3,711)
Increase (decrease) in cash and cash equivalents	7,673	22,051	(4,535)
Cash and cash equivalents at beginning of period	109,393	87,342	91,877
Cash and cash equivalents at end of period	$ 117,066	$ 109,393	$ 87,342