UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net (losses) earnings	$ 4,758	$ (1,142)
Adjustments to reconcile net (losses) earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	4,674	7,532
Gains on sales of property	(446)	(129)
Impairment of oil and natural gas properties	0	3
Provision for doubtful accounts	(32)	(8)
Stock-based compensation expense	3	0
Deferred income taxes	(832)	(926)
Net change in fair value contracts	(3)	(700)
Loss on deconsolidation of subsidiary	0	(1,635)
Changes in assets and liabilities:
Accounts receivable	2,852	13,581
Accounts receivable/payable, affiliates	0	(151)
Inventories	(9,321)	(2,887)
Income tax receivable	1,317	(336)
Prepayments and other current assets	67	887
Accounts payable	15,634	3,357
Accrued liabilities	2,441	(483)
Other	125	(461)
Net cash provided by operating activities	21,237	19,772
Investing activities:
Property and equipment additions	(2,728)	(2,108)
Proceeds from property sales	655	190
Insurance and state collateral (deposits) refunds	465	347
Net cash used in investing activities	(1,608)	(1,571)
Financing activities:
Principal repayments of capital lease obligations	(167)	0
Dividends paid on common stock	(1,856)	(1,856)
Net cash used in financing activities	(2,023)	(1,856)
Increase in cash and cash equivalents	17,606	16,345
Cash and cash equivalents at beginning of period	109,393	87,342
Cash and cash equivalents at end of period	$ 126,999	$ 103,687