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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 1,190us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,505us-gaap_CashAndCashEquivalentsAtCarryingValue
Treasury bills 6,542us-gaap_OtherShortTermInvestments 5,227us-gaap_OtherShortTermInvestments
Available-for-sale securities 1,256us-gaap_AvailableForSaleSecuritiesCurrent 2,718us-gaap_AvailableForSaleSecuritiesCurrent
Trade receivables, less allowance for doubtful accounts of $10 and $8, respectively 738us-gaap_AccountsReceivableNetCurrent 746us-gaap_AccountsReceivableNetCurrent
Inventories 1,224us-gaap_InventoryNet 1,060us-gaap_InventoryNet
Other current assets 163us-gaap_OtherAssetsCurrent 136us-gaap_OtherAssetsCurrent
Total current assets 11,113us-gaap_AssetsCurrent 11,392us-gaap_AssetsCurrent
Intangible assets, net 1,505us-gaap_FiniteLivedIntangibleAssetsNet 0us-gaap_FiniteLivedIntangibleAssetsNet
Property and equipment, net 1,146us-gaap_PropertyPlantAndEquipmentNet 1,217us-gaap_PropertyPlantAndEquipmentNet
Total assets 13,764us-gaap_Assets 12,609us-gaap_Assets
Current liabilities    
Current maturities of note payable 381us-gaap_LongTermDebtCurrent 0us-gaap_LongTermDebtCurrent
Accounts payable current 126us-gaap_AccountsPayableCurrent 59us-gaap_AccountsPayableCurrent
Accrued expenses current 392us-gaap_AccruedLiabilitiesCurrent 265us-gaap_AccruedLiabilitiesCurrent
Income tax payable 82us-gaap_AccruedIncomeTaxesCurrent 0us-gaap_AccruedIncomeTaxesCurrent
Total current liabilities 981us-gaap_LiabilitiesCurrent 324us-gaap_LiabilitiesCurrent
Long-term liabilities    
Note payable - long term 390us-gaap_LongTermDebtNoncurrent 0us-gaap_LongTermDebtNoncurrent
Contingent earn-out 472us-gaap_OtherLongTermDebtNoncurrent 0us-gaap_OtherLongTermDebtNoncurrent
Deferred income tax liability 391us-gaap_DeferredTaxLiabilitiesNoncurrent 1,022us-gaap_DeferredTaxLiabilitiesNoncurrent
Total long-term liabilities 1,253us-gaap_LiabilitiesNoncurrent 1,022us-gaap_LiabilitiesNoncurrent
Commitments and contingencies      
Stockholders' equity    
Common stock par value $0.10 per share; authorized 10,000,000 shares; issued and outstanding: 3,395,521 and 3,394,707 shares, respectively 339us-gaap_CommonStockValue 339us-gaap_CommonStockValue
Additional paid-in capital 1,816us-gaap_AdditionalPaidInCapitalCommonStock 1,746us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 8,641us-gaap_RetainedEarningsAccumulatedDeficit 7,547us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income (unrealized gain on available-for-sale securities, net of income tax) 734us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 1,631us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 11,530us-gaap_StockholdersEquity 11,263us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 13,764us-gaap_LiabilitiesAndStockholdersEquity $ 12,609us-gaap_LiabilitiesAndStockholdersEquity