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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net income	$ 8,914us-gaap_NetIncomeLoss	$ 7,528us-gaap_NetIncomeLoss	$ 6,979us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	712us-gaap_Depreciation	726us-gaap_Depreciation	768us-gaap_Depreciation
Loss (gain) on sale of equipment and property	31us-gaap_GainLossOnSaleOfPropertyPlantEquipment	(15)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Stock-based compensation expense	1,754us-gaap_ShareBasedCompensation	1,702us-gaap_ShareBasedCompensation	1,495us-gaap_ShareBasedCompensation
Excess tax benefits for share-based payments	(342)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	(136)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	(379)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Deferred income tax (benefit) provision	(805)us-gaap_DeferredIncomeTaxExpenseBenefit	78us-gaap_DeferredIncomeTaxExpenseBenefit	(498)us-gaap_DeferredIncomeTaxExpenseBenefit
(Increase) decrease in assets:
Accounts receivable	(348)us-gaap_IncreaseDecreaseInAccountsReceivable	(227)us-gaap_IncreaseDecreaseInAccountsReceivable	415us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories	40us-gaap_IncreaseDecreaseInInventories	(700)us-gaap_IncreaseDecreaseInInventories	(3,252)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	133us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	(232)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	(147)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Income taxes receivable	569us-gaap_IncreaseDecreaseInIncomeTaxesReceivable	(298)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable	(394)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Other non-current assets	790us-gaap_IncreaseDecreaseInOtherNoncurrentAssets	(184)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets	456us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Increase (decrease) in liabilities:
Accounts payable	(1,992)us-gaap_IncreaseDecreaseInAccountsPayable	1,323us-gaap_IncreaseDecreaseInAccountsPayable	1,254us-gaap_IncreaseDecreaseInAccountsPayable
Income taxes payable	342us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable	134us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable	(14)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Other accrued expenses	638us-gaap_IncreaseDecreaseInOtherAccruedLiabilities	(5)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities	1,731us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Other long-term liabilities	(990)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities	186us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities	(232)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net cash provided by operating activities	9,446us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	9,880us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	8,182us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
INVESTING ACTIVITIES
Capital expenditures	(451)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(521)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(354)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of assets	1,083us-gaap_ProceedsFromSaleOfProductiveAssets	15us-gaap_ProceedsFromSaleOfProductiveAssets
Investment in joint venture	(2,554)us-gaap_PaymentsToAcquireInterestInJointVenture
Sales and maturities of marketable securities	20,085us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities	14,576us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities	51,247us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Purchases of marketable securities	(21,110)us-gaap_PaymentsToAcquireMarketableSecurities	(14,339)us-gaap_PaymentsToAcquireMarketableSecurities	(34,082)us-gaap_PaymentsToAcquireMarketableSecurities
Net cash (used for) provided by investing activities	(2,947)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(269)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	16,811us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
FINANCING ACTIVITIES
Payment of dividends	(6,102)us-gaap_PaymentsOfDividends	(5,705)us-gaap_PaymentsOfDividends	(23,812)us-gaap_PaymentsOfDividends
Cash paid for common stock purchased and retired	(1,781)us-gaap_PaymentsForRepurchaseOfCommonStock	(576)us-gaap_PaymentsForRepurchaseOfCommonStock	(960)us-gaap_PaymentsForRepurchaseOfCommonStock
Repayment of capital lease obligation			(375)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Excess tax benefits for share-based payments	342us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	136us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	379us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds received upon exercise of stock options			467us-gaap_ProceedsFromStockOptionsExercised
Net cash used for financing activities	(7,541)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	(6,145)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	(24,301)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net (decrease) increase in cash and cash equivalents	(1,042)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	3,466us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	692us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year	5,114us-gaap_CashAndCashEquivalentsAtCarryingValue	1,648us-gaap_CashAndCashEquivalentsAtCarryingValue	956us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year	$ 4,072us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 5,114us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 1,648us-gaap_CashAndCashEquivalentsAtCarryingValue

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