UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net earnings	$ 4,908	$ 1,138
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	3,589	2,412
Gains on sales of property	(178)	(26)
Provision for doubtful accounts	(32)	0
Stock-based compensation expense	123	0
Deferred income taxes	834	(709)
Net change in fair value contracts	19	(2)
Gain on dissolution of investment in AREC	(498)	0
Changes in assets and liabilities:
Accounts receivable	(2,866)	4,200
Accounts receivable/payable, affiliates	(23)	0
Inventories	(6,458)	(7,075)
Income tax receivable	426	880
Prepayments and other current assets	(52)	153
Accounts payable	17,914	1,377
Accrued liabilities	2,432	851
Other	878	86
Net cash provided by operating activities	21,016	3,285
Investing activities:
Property and equipment additions	(8,351)	(866)
Proceeds from property sales	543	132
Proceeds from dissolution of AREC	923	0
Insurance and state collateral (deposits) refunds	842	603
Net cash used in investing activities	(6,043)	(131)
Financing activities:
Principal repayments of finance lease obligations	(218)	(83)
Dividends paid on common stock	(928)	(928)
Net cash used in financing activities	(1,146)	(1,011)
Increase in cash and cash equivalents	13,827	2,143
Cash and cash equivalents at beginning of period	117,066	109,393
Cash and cash equivalents at end of period	$ 130,893	$ 111,536