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STATEMENTS OF CASH FLOWS (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:    
Net income $ 370,554us-gaap_NetIncomeLoss $ 293,572us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Deferred income taxes (39,405)us-gaap_DeferredIncomeTaxExpenseBenefit 93,742us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation 221,452us-gaap_DepreciationAndAmortization 168,080us-gaap_DepreciationAndAmortization
Stock-based compensation 125,519us-gaap_ShareBasedCompensation 146,234us-gaap_ShareBasedCompensation
Unrealized loss on marketable securities 38,093us-gaap_MarketableSecuritiesUnrealizedGainLoss 90,218us-gaap_MarketableSecuritiesUnrealizedGainLoss
Deferred rent (2,553)us-gaap_OtherNoncashIncomeExpense (91)us-gaap_OtherNoncashIncomeExpense
Loss on retirement of fixed assets 96us-gaap_GainLossOnSaleOfPropertyPlantEquipment 259us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Tax benefits from stock option plans (92,790)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (10,539)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Changes in operating assets and liabilities:    
Accounts receivable, net (371,128)us-gaap_IncreaseDecreaseInAccountsReceivable 68,569us-gaap_IncreaseDecreaseInAccountsReceivable
Other current assets 157,337us-gaap_IncreaseDecreaseInOtherCurrentAssets (21,755)us-gaap_IncreaseDecreaseInOtherCurrentAssets
Other assets (29)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets (1,683)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Deferred revenue 920,784us-gaap_IncreaseDecreaseInDeferredRevenue (286,745)us-gaap_IncreaseDecreaseInDeferredRevenue
Accounts payable 50,780us-gaap_IncreaseDecreaseInAccountsPayable 42,381us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses (49,350)us-gaap_IncreaseDecreaseInAccruedLiabilities 118,818us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash provided by operating activities 1,329,360us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 701,060us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
(Purchase) sale of marketable securities (3,510)us-gaap_PaymentsToAcquireMarketableSecurities 237,393us-gaap_PaymentsToAcquireMarketableSecurities
Purchase of property and equipment (136,205)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (330,583)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (139,715)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (93,190)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Dividend paid to stockholders (402,450)us-gaap_PaymentsOfOrdinaryDividends (397,935)us-gaap_PaymentsOfOrdinaryDividends
Proceeds from exercise of stock options 51us-gaap_ProceedsFromStockOptionsExercised 6,500us-gaap_ProceedsFromStockOptionsExercised
Tax benefit from stock option plans 92,790us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 10,539us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash used in financing activities (309,609)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (380,896)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 880,036us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 226,974us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 6,649,432us-gaap_CashAndCashEquivalentsAtCarryingValue 6,422,458us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 7,529,468us-gaap_CashAndCashEquivalentsAtCarryingValue 6,649,432us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the year for:    
Income taxes $ 246,195us-gaap_IncomeTaxesPaid $ 250,600us-gaap_IncomeTaxesPaid