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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 13,181,000us-gaap_NetIncomeLoss $ 23,969,000us-gaap_NetIncomeLoss $ 15,876,000us-gaap_NetIncomeLoss
Loss from discontinued operations, net of tax (7,848,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (3,166,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (2,566,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Income from continuing operations 21,029,000us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems 27,135,000us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems 18,442,000us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:      
Depreciation and amortization 8,052,000us-gaap_DepreciationDepletionAndAmortization 7,901,000us-gaap_DepreciationDepletionAndAmortization 8,385,000us-gaap_DepreciationDepletionAndAmortization
Realized gain (loss) on investment securities, net (771,000)us-gaap_GainLossOnSaleOfInvestments (74,000)us-gaap_GainLossOnSaleOfInvestments 2,000us-gaap_GainLossOnSaleOfInvestments
Share-based compensation 3,918,000us-gaap_ShareBasedCompensation 3,209,000us-gaap_ShareBasedCompensation 2,850,000us-gaap_ShareBasedCompensation
Deferred income taxes 286,000us-gaap_DeferredIncomeTaxExpenseBenefit 428,000us-gaap_DeferredIncomeTaxExpenseBenefit (598,000)us-gaap_DeferredIncomeTaxExpenseBenefit
(Gain)/loss on disposal of fixed assets (29,000)us-gaap_GainLossOnDispositionOfAssets 392,000us-gaap_GainLossOnDispositionOfAssets 100,000us-gaap_GainLossOnDispositionOfAssets
Changes in assets and liabilities which provided (used) cash:      
Accounts receivable (708,000)us-gaap_IncreaseDecreaseInAccountsReceivable 87,000us-gaap_IncreaseDecreaseInAccountsReceivable (389,000)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory 1,802,000us-gaap_IncreaseDecreaseInInventories 2,615,000us-gaap_IncreaseDecreaseInInventories (734,000)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets (349,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 204,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (810,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets (318,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets 746,000us-gaap_IncreaseDecreaseInOtherOperatingAssets 155,000us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and accrued expenses (376,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (1,427,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 8,974,000us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Income taxes (5,198,000)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 972,000us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 4,561,000us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Net cash provided by operating activities- continuing operations 27,338,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 42,188,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 40,938,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net cash provided by (used in) operating activities- discontinued operations (1,802,000)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations 172,000us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations (674,000)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash provided by operating activities 25,536,000us-gaap_NetCashProvidedByUsedInOperatingActivities 42,360,000us-gaap_NetCashProvidedByUsedInOperatingActivities 40,264,000us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flow from Investing Activities:      
Sale of investment securities 29,636,000us-gaap_ProceedsFromSaleOfShortTermInvestments 14,359,000us-gaap_ProceedsFromSaleOfShortTermInvestments 8,109,000us-gaap_ProceedsFromSaleOfShortTermInvestments
Purchase of investment securities (26,080,000)us-gaap_PaymentsToAcquireInvestments (25,355,000)us-gaap_PaymentsToAcquireInvestments (8,390,000)us-gaap_PaymentsToAcquireInvestments
Purchase of property and equipment (7,024,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (11,386,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (8,127,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities- continuing operations (3,468,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (22,382,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (8,408,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Net cash provided by (used in) investing activities- discontinued operations 950,000us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations (220,000)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations (3,256,000)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Net cash used in investing activities (2,518,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (22,602,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (11,664,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flow from Financing Activities:      
Repayment of long-term debt and capital leases (222,000)us-gaap_RepaymentsOfLongTermDebt (3,641,000)us-gaap_RepaymentsOfLongTermDebt (1,444,000)us-gaap_RepaymentsOfLongTermDebt
Decrease in note receivable 52,000us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 26,000us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 18,000us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net shares repurchased for employees taxes (1,152,000)us-gaap_PaymentsForRepurchaseOfOtherEquity 0us-gaap_PaymentsForRepurchaseOfOtherEquity 0us-gaap_PaymentsForRepurchaseOfOtherEquity
Excess tax benefits from share-based compensation 275,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 383,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 1,265,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Purchase of treasury stock (33,894,000)us-gaap_PaymentsForRepurchaseOfCommonStock (20,081,000)us-gaap_PaymentsForRepurchaseOfCommonStock (2,764,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used in financing activities- continuing operations (34,941,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (23,313,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (2,925,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net cash used in financing activities- discontinued operations 0us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations 0us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations 0us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations
Net cash used in financing activities (34,941,000)us-gaap_NetCashProvidedByUsedInFinancingActivities (23,313,000)us-gaap_NetCashProvidedByUsedInFinancingActivities (2,925,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
NET CHANGE IN CASH AND CASH EQUIVALENTS (11,923,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3,555,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 25,675,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents - beginning of the period 36,382,000us-gaap_CashAndCashEquivalentsAtCarryingValue 39,937,000us-gaap_CashAndCashEquivalentsAtCarryingValue 14,262,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents - end of period 24,459,000us-gaap_CashAndCashEquivalentsAtCarryingValue 36,382,000us-gaap_CashAndCashEquivalentsAtCarryingValue 39,937,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:      
Interest paid 131,000us-gaap_InterestPaid 57,000us-gaap_InterestPaid 123,000us-gaap_InterestPaid
Income taxes paid 12,721,000us-gaap_IncomeTaxesPaid 9,983,000us-gaap_IncomeTaxesPaid 4,093,000us-gaap_IncomeTaxesPaid
Supplemental disclosure of non cash activity:      
Capitalized lease additions $ 0us-gaap_CapitalLeaseObligationsIncurred $ 0us-gaap_CapitalLeaseObligationsIncurred $ 104,000us-gaap_CapitalLeaseObligationsIncurred