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Consolidated Cash Flow Statements (Unaudited) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:    
Net loss $ (1,184,000)us-gaap_NetIncomeLoss $ (9,887,000)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 10,409,000us-gaap_DepreciationDepletionAndAmortization 12,401,000us-gaap_DepreciationDepletionAndAmortization
Deferred income taxes 1,050,000us-gaap_DeferredIncomeTaxExpenseBenefit (1,286,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Non-cash compensation 1,597,000us-gaap_ShareBasedCompensation 1,689,000us-gaap_ShareBasedCompensation
Deferred revenue recognized (8,657,000)us-gaap_DeferredRevenueRevenueRecognized (8,000,000)us-gaap_DeferredRevenueRevenueRecognized
Deferred loan costs recognized 78,000us-gaap_AmortizationOfFinancingCosts 78,000us-gaap_AmortizationOfFinancingCosts
Gain on sale of assets (19,000)us-gaap_GainLossOnDispositionOfAssets (1,516,000)us-gaap_GainLossOnDispositionOfAssets
Provision for excess and obsolete inventory 1,150,000us-gaap_InventoryWriteDown 1,251,000us-gaap_InventoryWriteDown
Goodwill impairment 0us-gaap_GoodwillImpairmentLoss 6,900,000us-gaap_GoodwillImpairmentLoss
Other noncash items (993,000)us-gaap_OtherNoncashExpense 565,000us-gaap_OtherNoncashExpense
Contributions to pension plans (1,090,000)us-gaap_PensionContributions (663,000)us-gaap_PensionContributions
Changes in operating assets and liabilities:    
Accounts receivable (9,091,000)us-gaap_IncreaseDecreaseInAccountsReceivable (19,000)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory 4,276,000us-gaap_IncreaseDecreaseInInventories (1,708,000)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets (143,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (556,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable 2,425,000us-gaap_IncreaseDecreaseInAccountsPayable 705,000us-gaap_IncreaseDecreaseInAccountsPayable
Accrued and other liabilities 3,237,000us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities (247,000)us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Net cash provided by (used in) operating activities 3,045,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (293,000)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Capital expenditures (5,259,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (5,053,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of assets 30,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 2,265,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash used in investing activities (5,229,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (2,788,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Net change in debt under Credit Facility (7,000,000)us-gaap_ProceedsFromRepaymentsOfLinesOfCredit 5,000,000us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
Common stock repurchases (426,000)us-gaap_PaymentsForRepurchaseOfCommonStock (36,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Indirect repurchase of shares for minimum statutory tax withholdings (429,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (657,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Cash dividends paid (1,635,000)us-gaap_PaymentsOfDividendsCommonStock (1,216,000)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from issuance of common stock 3,000us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock
Net cash (used in) provided by financing activities (9,487,000)us-gaap_NetCashProvidedByUsedInFinancingActivities 3,091,000us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash and cash equivalents (11,671,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 10,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 18,674,000us-gaap_CashAndCashEquivalentsAtCarryingValue 18,664,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year $ 7,003,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 18,674,000us-gaap_CashAndCashEquivalentsAtCarryingValue