Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 6,391	$ 5,641
Receivables (less allowance for doubtful accounts: March 31, 2015 - $12; December 31, 2014 - $12)	32,866	32,672
Inventory	37,654	34,441
Prepaid expenses	1,743	1,179
Deferred income taxes	6,524	7,924
Refundable income taxes	0	388
Total current assets	85,178	82,245
Property and equipment	202,850	198,176
Less accumulated depreciation and amortization	(137,306)	(134,295)
Property and equipment, net	65,544	63,881
Equity method investments	13,673	12,373
Other assets	2,192	2,100
Total assets	166,587	160,599
Current Liabilities
Current maturities of long-term debt	2,567	2,613
Accounts payable	16,539	16,076
Accounts payable to affiliate, net	4,018	3,333
Accrued expenses	7,848	8,010
Income taxes payable	574	0
Other current liabilities	725	716
Total current liabilities	32,271	30,748
Long-term debt, less current maturities	7,652	7,670
Revolving credit facility	14	0
Deferred credit	3,939	4,099
Accrued retirement health and life insurance benefits	4,305	4,420
Deferred income taxes	9,924	9,297
Total liabilities	58,105	56,234
Commitments and Contingencies (Note 4)
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 March 31, 2015 and December 31, 2014, and 17,674,559 shares outstanding at March 31, 2015 and December 31, 2014	6,715	6,715
Additional paid-in capital	10,109	9,904
Retained earnings	93,437	89,454
Accumulated other comprehensive loss, net of tax	(803)	(732)
Treasury stock, at cost
Shares of 441,406 at March 31, 2015 and December 31, 2014	(980)	(980)
Total stockholders’ equity	108,482	104,365
Total liabilities and stockholders’ equity	$ 166,587	$ 160,599