Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 2,280	$ 3,084
Receivables (less allowance for doubtful accounts: June 30, 2018 - $24; December 31, 2017 - $24)	35,758	34,347
Inventory	106,487	93,149
Prepaid expenses	2,802	2,182
Refundable income taxes	1,534	1,980
Total current assets	148,861	134,742
Property and equipment	278,548	267,288
Less accumulated depreciation and amortization	(169,712)	(164,237)
Property and equipment, net	108,836	103,051
Other assets	2,458	2,535
Total assets	260,155	240,328
Current Liabilities
Current maturities of long-term debt	379	372
Accounts payable	23,333	30,037
Accrued expenses	7,937	11,171
Total current liabilities	31,649	41,580
Long-term debt, less current maturities	21,225	21,407
Revolving credit facility	18,857	2,775
Deferred credits	1,789	2,151
Accrued retirement, health and life insurance benefits	2,989	3,133
Other noncurrent liabilities	545	540
Deferred income taxes	741	12
Total liabilities	77,795	71,598
Contingencies
Capital stock
Preferred, 5% non-cumulative; $10 par value; authorized 1,000 shares; issued and outstanding 437 shares	4	4
Common stock
No par value; authorized 40,000,000 shares; issued 18,115,965 shares at June 30, 2018 and December 31, 2017, and 16,847,737 and 16,797,420 shares outstanding at June 30, 2018 and December 31, 2017, respectively	6,715	6,715
Additional paid-in capital	14,484	13,912
Retained earnings	180,835	167,129
Accumulated other comprehensive loss	(283)	(311)
Treasury stock, at cost
Shares of 1,268,228 at June 30, 2018 and 1,318,545 at December 31, 2017	(19,395)	(18,719)
Total stockholders’ equity	182,360	168,730
Total liabilities and stockholders’ equity	$ 260,155	$ 240,328