Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Current Assets
Restricted cash		$ 12,000
Receivables (less allowance for doubtful accounts: March 31, 2013 - $20; December 31, 2012 - $12)	34,345,000	35,325,000
Inventory	38,998,000	36,532,000
Prepaid expenses	1,351,000	697,000
Deferred income taxes	5,044,000	5,283,000
Refundable income taxes	280,000	242,000
Total current assets	80,018,000	78,091,000
Property and equipment	188,764,000	190,519,000
Less accumulated depreciation and amortization	(116,227,000)	(115,128,000)
Property and equipment, net	72,537,000	75,391,000
Equity method investments	6,347,000	7,301,000
Other noncurrent assets	2,312,000	2,388,000
Total assets	161,214,000	163,171,000
Current Liabilities
Current maturities of long-term debt	1,642,000	1,683,000
Accounts payable	22,977,000	18,860,000
Accounts payable to affiliate, net	721,000	4,008,000
Accrued expenses	6,677,000	5,220,000
Total current liabilities	32,017,000	29,771,000
Long-term debt, less current maturities	4,783,000	5,168,000
Revolving credit facility	21,766,000	25,893,000
Deferred credit	4,036,000	4,133,000
Accrued retirement health and life insurance benefits	4,985,000	5,096,000
Other noncurrent liabilities	1,006,000	1,000,000
Deferred income taxes	5,044,000	5,283,000
Total liabilities	73,637,000	76,344,000
Preferred, 5% non-cumulative; $10 par value; authorized 1,000 shares; issued and outstanding 437 shares	4,000	4,000
Common stock
No par value; authorized 40,000,000 shares; issued 18,115,965 shares at March 31, 2013 and December 31, 2012, 17,914,119 and 17,934,233 shares outstanding at March 31, 2013 and December 31, 2012, respectively	6,715,000	6,715,000
Additional paid-in capital	8,247,000	7,894,000
Retained earnings	73,092,000	72,531,000
Accumulated other comprehensive loss	(382,000)	(233,000)
Treasury stock, at cost
201,846 and 181,732 shares at March 31, 2013 and December 31, 2012, respectively	(99,000)	(84,000)
Total stockholders’ equity	87,577,000	86,827,000
Total liabilities and stockholders’ equity	$ 161,214,000	$ 163,171,000