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BALANCE SHEETS (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current Assets:    
Cash and cash equivalents $ 8,121,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 7,237,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 6,742,000us-gaap_AccountsReceivableNetCurrent 7,492,000us-gaap_AccountsReceivableNetCurrent
Available for sale investments 9,861,000us-gaap_AvailableForSaleSecuritiesCurrent 9,698,000us-gaap_AvailableForSaleSecuritiesCurrent
Inventories 509,000us-gaap_InventoryNet 523,000us-gaap_InventoryNet
Deferred tax assets   52,000us-gaap_DeferredTaxAssetsNetCurrent
Income tax receivable 340,000us-gaap_IncomeTaxesReceivable 287,000us-gaap_IncomeTaxesReceivable
Prepaid expenses and other 563,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 715,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total Current Assets 26,136,000us-gaap_AssetsCurrent 26,004,000us-gaap_AssetsCurrent
Other Assets:    
Property and equipment, net 1,379,000us-gaap_PropertyPlantAndEquipmentNet 1,467,000us-gaap_PropertyPlantAndEquipmentNet
Other, net 2,934,000us-gaap_OtherAssetsNoncurrent 3,056,000us-gaap_OtherAssetsNoncurrent
Total Assets 30,449,000us-gaap_Assets 30,527,000us-gaap_Assets
Current Liabilities:    
Accounts payable 2,809,000us-gaap_AccountsPayableCurrent 3,088,000us-gaap_AccountsPayableCurrent
Accrued liabilities:    
Compensation 831,000us-gaap_DeferredCompensationLiabilityCurrent 1,199,000us-gaap_DeferredCompensationLiabilityCurrent
Other 556,000us-gaap_OtherAccruedLiabilitiesCurrent 719,000us-gaap_OtherAccruedLiabilitiesCurrent
Deferred tax liabilities 67,000us-gaap_DeferredTaxLiabilitiesCurrent  
Income tax payable 89,000us-gaap_AccruedIncomeTaxesCurrent 82,000us-gaap_AccruedIncomeTaxesCurrent
Deferred revenue 673,000us-gaap_DeferredRevenueCurrent 172,000us-gaap_DeferredRevenueCurrent
Total Current Liabilities 5,025,000us-gaap_LiabilitiesCurrent 5,260,000us-gaap_LiabilitiesCurrent
Long-Term Liabilities:    
Deferred tax liabilities 222,000us-gaap_DeferredTaxLiabilitiesNoncurrent 222,000us-gaap_DeferredTaxLiabilitiesNoncurrent
Accrued income taxes 486,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent 486,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Total Long-Term Liabilities 708,000us-gaap_LiabilitiesNoncurrent 708,000us-gaap_LiabilitiesNoncurrent
Commitments and Contingencies      
Shareholders' Equity:    
Common stock, par value $.01: Authorized shares - 40,000,000 Issued shares - 12,223,000 at March 31, 2015 and 12,216,000 at December 31, 2014 Outstanding shares - 12,198,000 at March 31, 2015 and 12,191,000 at December 31, 2014 122,000us-gaap_CommonStockValue 122,000us-gaap_CommonStockValue
Additional paid-in capital 19,232,000us-gaap_AdditionalPaidInCapitalCommonStock 19,177,000us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 5,367,000us-gaap_RetainedEarningsAccumulatedDeficit 5,271,000us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (5,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (11,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total Shareholders' Equity 24,716,000us-gaap_StockholdersEquity 24,559,000us-gaap_StockholdersEquity
Total Liabilities and Shareholders' Equity $ 30,449,000us-gaap_LiabilitiesAndStockholdersEquity $ 30,527,000us-gaap_LiabilitiesAndStockholdersEquity