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BALANCE SHEETS (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current Assets:    
Cash and cash equivalents $ 7,237,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 21,763,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 7,492,000us-gaap_AccountsReceivableNetCurrent 4,287,000us-gaap_AccountsReceivableNetCurrent
Available for sale investments 9,698,000us-gaap_AvailableForSaleSecuritiesCurrent  
Inventories 523,000us-gaap_InventoryNet 307,000us-gaap_InventoryNet
Deferred tax assets 52,000us-gaap_DeferredTaxAssetsNetCurrent 171,000us-gaap_DeferredTaxAssetsNetCurrent
Income tax receivable 287,000us-gaap_IncomeTaxesReceivable 11,000us-gaap_IncomeTaxesReceivable
Prepaid expenses and other 715,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 324,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total Current Assets 26,004,000us-gaap_AssetsCurrent 26,863,000us-gaap_AssetsCurrent
Other Assets:    
Property and equipment, net 1,467,000us-gaap_PropertyPlantAndEquipmentNet 1,753,000us-gaap_PropertyPlantAndEquipmentNet
Other, net 3,056,000us-gaap_OtherAssetsNoncurrent 2,956,000us-gaap_OtherAssetsNoncurrent
Total Assets 30,527,000us-gaap_Assets 31,572,000us-gaap_Assets
Current Liabilities:    
Accounts payable 3,088,000us-gaap_AccountsPayableCurrent 2,636,000us-gaap_AccountsPayableCurrent
Accrued liabilities:    
Compensation 1,199,000us-gaap_DeferredCompensationLiabilityCurrent 1,236,000us-gaap_DeferredCompensationLiabilityCurrent
Other 719,000us-gaap_OtherAccruedLiabilitiesCurrent 505,000us-gaap_OtherAccruedLiabilitiesCurrent
Income tax payable 82,000us-gaap_AccruedIncomeTaxesCurrent 22,000us-gaap_AccruedIncomeTaxesCurrent
Deferred revenue 172,000us-gaap_DeferredRevenueCurrent 261,000us-gaap_DeferredRevenueCurrent
Total Current Liabilities 5,260,000us-gaap_LiabilitiesCurrent 4,660,000us-gaap_LiabilitiesCurrent
Long-Term Liabilities:    
Deferred tax liabilities 222,000us-gaap_DeferredTaxLiabilitiesNoncurrent 284,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Accrued income taxes 486,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent 458,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Total Long-Term Liabilities 708,000us-gaap_LiabilitiesNoncurrent 742,000us-gaap_LiabilitiesNoncurrent
Commitments and Contingencies      
Shareholders' Equity:    
Common stock, par value $.01: Authorized shares - 40,000,000 Issued shares - 12,216,000 in 2014 and 12,782,000 in 2013 Outstanding shares - 12,191,000 in 2014 and 12,782,000 in 2013 122,000us-gaap_CommonStockValue 128,000us-gaap_CommonStockValue
Additional paid-in capital 19,177,000us-gaap_AdditionalPaidInCapitalCommonStock 20,982,000us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 5,271,000us-gaap_RetainedEarningsAccumulatedDeficit 5,060,000us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (11,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Total Shareholders' Equity 24,559,000us-gaap_StockholdersEquity 26,170,000us-gaap_StockholdersEquity
Total Liabilities and Shareholders' Equity $ 30,527,000us-gaap_LiabilitiesAndStockholdersEquity $ 31,572,000us-gaap_LiabilitiesAndStockholdersEquity