Income Tax Provision - Deferred tax assets (liabilities) (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Inventories	$ 319	$ 380
Accrued employee compensation and benefit costs	316	373
Operating loss and credit carryforwards	252	300
Other	73	38
Minimum pension liability	44	39
Total deferred tax assets	1,004	1,130
Valuation allowance	(233)	(270)
Net deferred tax asset	771	860
Property, plant and equipment	(436)	(602)
Total deferred tax liabilities	(436)	(602)
Net deferred tax asset	$ 335	$ 258