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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
OPERATING ACTIVITIES |  |  |
Net income | $ 8,914 us-gaap_NetIncomeLoss | $ 7,528 us-gaap_NetIncomeLoss | $ 6,979 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation expense | 712 us-gaap_Depreciation | 726 us-gaap_Depreciation | 768 us-gaap_Depreciation
Loss (gain) on sale of equipment and property | 31 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | (15)us-gaap_GainLossOnSaleOfPropertyPlantEquipment |
Stock-based compensation expense | 1,754 us-gaap_ShareBasedCompensation | 1,702 us-gaap_ShareBasedCompensation | 1,495 us-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 | 78 us-gaap_DeferredIncomeTaxExpenseBenefit | (498)us-gaap_DeferredIncomeTaxExpenseBenefit
(Increase) decrease in assets: |  |  |
Accounts receivable | (348)us-gaap_IncreaseDecreaseInAccountsReceivable | (227)us-gaap_IncreaseDecreaseInAccountsReceivable | 415 us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories | 40 us-gaap_IncreaseDecreaseInInventories | (700)us-gaap_IncreaseDecreaseInInventories | (3,252)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets | 133 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (232)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (147)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Income taxes receivable | 569 us-gaap_IncreaseDecreaseInIncomeTaxesReceivable | (298)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable | (394)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Other non-current assets | 790 us-gaap_IncreaseDecreaseInOtherNoncurrentAssets | (184)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets | 456 us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Increase (decrease) in liabilities: |  |  |
Accounts payable | (1,992)us-gaap_IncreaseDecreaseInAccountsPayable | 1,323 us-gaap_IncreaseDecreaseInAccountsPayable | 1,254 us-gaap_IncreaseDecreaseInAccountsPayable
Income taxes payable | 342 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 134 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (14)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Other accrued expenses | 638 us-gaap_IncreaseDecreaseInOtherAccruedLiabilities | (5)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities | 1,731 us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Other long-term liabilities | (990)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities | 186 us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities | (232)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net cash provided by operating activities | 9,446 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 9,880 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 8,182 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
INVESTING ACTIVITIES |  |  |
Capital expenditures | (451)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (521)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (354)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of assets | 1,083 us-gaap_ProceedsFromSaleOfProductiveAssets | 15 us-gaap_ProceedsFromSaleOfProductiveAssets |
Investment in joint venture | (2,554)us-gaap_PaymentsToAcquireInterestInJointVenture |  |
Sales and maturities of marketable securities | 20,085 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities | 14,576 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities | 51,247 us-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 | 16,811 us-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 | 342 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 136 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 379 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds received upon exercise of stock options |  |  | 467 us-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 | 3,466 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 692 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year | 5,114 us-gaap_CashAndCashEquivalentsAtCarryingValue | 1,648 us-gaap_CashAndCashEquivalentsAtCarryingValue | 956 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year | $ 4,072 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 5,114 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 1,648 us-gaap_CashAndCashEquivalentsAtCarryingValue

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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