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INCOME TAXES - Deferred income tax assets and liabilities (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Allowance for doubtful accounts $ 94us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts $ 95us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Accruals and reserves 3,767us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 3,739us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Other 222us-gaap_DeferredTaxAssetsOther 54us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 4,083us-gaap_DeferredTaxAssetsGross 3,888us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Property, plant, and equipment 2,184us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 1,842us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities 2,184us-gaap_DeferredIncomeTaxLiabilities 1,842us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset $ 1,899us-gaap_DeferredTaxAssetsLiabilitiesNet $ 2,046us-gaap_DeferredTaxAssetsLiabilitiesNet