Income Taxes (Details) - The income tax effects of temporary differences that comprise deferred tax assets and liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current deferred tax assets:
Accounts receivable	$ 268	$ 243
Employee benefits	901	978
Other accrued expenses	507	278
Gross current deferred tax asset	1,676	1,499
Less valuation allowance	(977)	(537)
Net current deferred tax asset	699	962
Noncurrent deferred tax assets (liabilities)
Property, plant and equipment	(6,306)	(6,211)
Employee benefits	3,339	3,377
Other noncurrent assets	109	142
AMT credit	631	649
Net operating loss	9,578	4,131
Gross non-current deferred tax assets (liabilities)	7,351	2,088
Less valuation allowance	(8,050)	(3,050)
Net noncurrent deferred tax assets (liabilities)	$ (699)	$ (962)