INCOME TAXES - Deferred income tax assets and liabilities (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Allowance for doubtful accounts	$ 95	$ 95
Accruals and reserves	3,739	3,390
Other	54	96
Total deferred tax assets	3,888	3,581
Deferred tax liabilities:
Property, plant, and equipment	1,842	1,758
Total deferred tax liabilities	1,842	1,758
Net deferred tax asset	$ 2,046	$ 1,823