CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH PROVIDED BY OPERATIONS:
Net earnings (loss)	$ 2,513	$ (1,275)	$ 6,523
Adjustments to reconcile net earnings to net cash from operating activities -
Depreciation, depletion and amortization	18,792	23,717	24,615
Property sales (gains) oil and natural gas	0	0	(2,528)
Property sales (gains) other	(1,966)	(535)	(1,028)
Dry hole costs incurred	0	817	1,034
Impairment of oil and natural gas properties	313	12,082	8,009
Provision for doubtful accounts	19	27	(73)
Deferred income taxes (includes equity investments)	(857)	(4,843)	(6,151)
Net change in fair value contracts	(243)	188	402
Equity investment (earnings) losses	468	0	0
Impairment of equity investment	1,732	0	0
Decrease (increase) in accounts receivable	(15,368)	72,594	99,749
Decrease (increase) in inventories	(5,399)	5,810	14,135
Decrease (increase) in income tax receivable	(148)	(1,617)	1,127
Decrease (increase) in prepayments	492	8,351	5,839
Increase (decrease) in accounts payable	6,984	(87,404)	(104,887)
Increase (decrease) in accrued and other liabilities	52	(166)	448
Other changes, net	(440)	(2,269)	(81)
Net cash provided by operating activities	6,944	25,477	47,133
INVESTING ACTIVITIES:
Property and equipment additions	(8,484)	(11,074)	(30,523)
Insurance and state collateral (deposits) refunds	1,710	283	(493)
Investments	(4,700)	0	0
Proceeds from property sales	3,706	719	7,045
Net cash (used in) investing activities	(7,768)	(10,072)	(23,971)
FINANCING ACTIVITIES:
Dividend payments	(3,711)	(3,712)	(3,711)
Net cash (used in) financing activities	(3,711)	(3,712)	(3,711)
Increase (decrease) in cash and cash equivalents	(4,535)	11,693	19,451
Cash and cash equivalents at beginning of year	91,877	80,184	60,733
Cash and cash equivalents at end of year	$ 87,342	$ 91,877	$ 80,184