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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating Activities:    
Net income $ 2,365us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 4,492us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 3,962us-gaap_DepreciationDepletionAndAmortization 3,601us-gaap_DepreciationDepletionAndAmortization
Amortization of deferred financing costs 11us-gaap_AmortizationOfFinancingCosts 11us-gaap_AmortizationOfFinancingCosts
Deferred income taxes 7us-gaap_DeferredIncomeTaxesAndTaxCredits 85us-gaap_DeferredIncomeTaxesAndTaxCredits
Loss on sale of property, plant and equipment 30us-gaap_GainLossOnSaleOfPropertyPlantEquipment 28us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Stock-based compensation 268us-gaap_ShareBasedCompensation 233us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:    
Trade receivables, net 1,416us-gaap_IncreaseDecreaseInAccountsReceivable (4,735)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (450)us-gaap_IncreaseDecreaseInInventories 1,696us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 793us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (271)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets   1us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and accrued expenses (1,020)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (1,374)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Other liabilities 141us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 30us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities 7,523us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 3,797us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing Activities:    
Purchase of property, plant and equipment (3,424)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,856)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property, plant and equipment 66us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 97us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash used in investing activities (3,358)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (2,759)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing Activities:    
Repayments of term loans (1,250)us-gaap_RepaymentsOfLongTermDebt (1,250)us-gaap_RepaymentsOfLongTermDebt
Cash dividends paid (700)us-gaap_PaymentsOfDividendsCommonStock (697)us-gaap_PaymentsOfDividendsCommonStock
Purchase of treasury shares (78)us-gaap_PaymentsForRepurchaseOfCommonStock (79)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used in financing activities (2,028)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (2,026)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 2,137us-gaap_NetCashProvidedByUsedInContinuingOperations (988)us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents at beginning of period 58,332us-gaap_CashAndCashEquivalentsAtCarryingValue 49,475us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 60,469us-gaap_CashAndCashEquivalentsAtCarryingValue $ 48,487us-gaap_CashAndCashEquivalentsAtCarryingValue