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Statements of Cash Flows (Unaudited) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Cash Flows [Abstract]    
Net loss $ (355,629)us-gaap_NetIncomeLoss $ (923,452)us-gaap_NetIncomeLoss
Net loss from discontinued operations, net of tax    (45,347)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Net loss from continuing operations (355,629)us-gaap_IncomeLossFromContinuingOperations (968,799)us-gaap_IncomeLossFromContinuingOperations
Depreciation 20,994us-gaap_Depreciation 35,446us-gaap_Depreciation
Provision for bad debts 10,442us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts   
Stock compensation    312,298us-gaap_ShareBasedCompensation
Stock issued for services 56,906us-gaap_StockIssuedDuringPeriodValueIssuedForServices   
Amortization of beneficial conversion feature 9,609us-gaap_OtherAmortizationOfDeferredCharges 32,550us-gaap_OtherAmortizationOfDeferredCharges
Accounts receivable (31,088)us-gaap_IncreaseDecreaseInAccountsReceivable 130,567us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses 14,633us-gaap_IncreaseDecreaseInPrepaidExpense (35,132)us-gaap_IncreaseDecreaseInPrepaidExpense
Inventory    611us-gaap_IncreaseDecreaseInInventories
Accounts payable and accrued liabilities (109,517)us-gaap_IncreaseDecreaseInAccountsPayable (52,905)us-gaap_IncreaseDecreaseInAccountsPayable
Taxes payable (72,685)us-gaap_IncreaseDecreaseInAccruedTaxesPayable 103,923us-gaap_IncreaseDecreaseInAccruedTaxesPayable
Deferred revenue 34,196us-gaap_IncreaseDecreaseInDeferredRevenue (52,445)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash used in operating activities- continuing operations (422,139)us-gaap_NetCashProvidedByUsedInContinuingOperations (493,886)us-gaap_NetCashProvidedByUsedInContinuingOperations
Net cash provided by operating activities- discontinued operations    63,119us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash provided used in operating activities (422,139)us-gaap_NetCashProvidedByUsedInOperatingActivities (430,767)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash paid for purchase of fixed assets (9,613)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (53,233)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities- discontinued operations    3,161us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used by investing activities (9,613)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (50,072)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Repayment of auto loan payable (3,938)GRST_RepaymentOfAutoLoanPayable (3,643)GRST_RepaymentOfAutoLoanPayable
Changes in restricted cash 7,350us-gaap_IncreaseDecreaseInRestrictedCashAndInvestmentsForOperatingActivities 3,550us-gaap_IncreaseDecreaseInRestrictedCashAndInvestmentsForOperatingActivities
Proceeds from bank overdraft 9,758us-gaap_ProceedsFromRepaymentsOfBankOverdrafts (80,048)us-gaap_ProceedsFromRepaymentsOfBankOverdrafts
Proceeds from issuance of short term notes    (11,000)us-gaap_ProceedsFromIssuanceOfDebt
Repayment of short term notes (18,685)us-gaap_ProceedsFromRepaymentsOfShortTermDebt (148,281)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Proceeds from issuance of related party notes, net 25,398us-gaap_ProceedsFromRelatedPartyDebt (192,103)us-gaap_ProceedsFromRelatedPartyDebt
Repayment of related party notes    103,817us-gaap_RepaymentOfNotesReceivableFromRelatedParties
Proceeds from issuance of common stock    440,548us-gaap_ProceedsFromIssuanceOfCommonStock
Net cash provided by financing activities- continuing operations 19,883us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 112,840us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net cash provided by financing activities- discontinued operations    173,825GRST_NetCashProvidedByUsedInFinancingActivitiesDisContinuingOperations
Net cash provided by financing activities 19,883us-gaap_NetCashProvidedByUsedInFinancingActivities 286,665us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate on cash 329,230us-gaap_EffectOfExchangeRateOnCash 194,174us-gaap_EffectOfExchangeRateOnCash
Net decrease in cash (82,639)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease   
Cash, beginning of period 88,152us-gaap_Cash   
Cash, end of period 5,513us-gaap_Cash   
Cash paid for interest 38,190us-gaap_InterestPaid 145,523us-gaap_InterestPaid
Cash paid for income taxes      
Common stock issued as a result of conversion of convertible notes payable 8,117us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 397,298us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities