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Statements of Cash Flows (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Net loss $ (1,900,273)us-gaap_NetIncomeLoss $ (3,527,573)us-gaap_NetIncomeLoss
Net loss from discontinued operations, net of tax (248,181)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax  
Net loss from continuing operations (1,652,092)us-gaap_IncomeLossFromContinuingOperations  
Depreciation 83,701us-gaap_Depreciation  
Provision for bad debts (1,148)us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts  
Stock compensation 679,858us-gaap_ShareBasedCompensation  
Stock issued for services   380,850us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Amortization of beneficial conversion feature 21,650us-gaap_OtherAmortizationOfDeferredCharges  
Accounts receivable 30,819us-gaap_IncreaseDecreaseInAccountsReceivable  
Prepaid expenses 38,256us-gaap_IncreaseDecreaseInPrepaidExpense  
Due to related parties     
Accounts payable and accrued liabilities 368,364us-gaap_IncreaseDecreaseInAccountsPayable  
Taxes payable 434,378us-gaap_IncreaseDecreaseInAccruedTaxesPayable  
Deferred revenue 36,364us-gaap_IncreaseDecreaseInDeferredRevenue  
Net cash provided by (used in) operating activities- continuing operations 40,150us-gaap_NetCashProvidedByUsedInContinuingOperations  
Net cash provided by (used in) operating activities- discontinued operations 531,788us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations  
Net cash provided operating activities 571,938us-gaap_NetCashProvidedByUsedInOperatingActivities  
Cash paid for purchase of fixed assets (56,998)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment  
Net cash used in investing activities (56,998)us-gaap_NetCashProvidedByUsedInInvestingActivities  
Repayment of notes payable (328)us-gaap_RepaymentsOfNotesPayable  
Replayment for loans payable (9,992)us-gaap_RepaymentsOfLongtermLoansFromVendors  
Changes in restricted cash 7,820us-gaap_IncreaseDecreaseInRestrictedCashAndInvestmentsForOperatingActivities  
Proceeds from bank overdraft     
Proceeds from issuance of short term notes 150,000us-gaap_ProceedsFromIssuanceOfDebt  
Repayment of related party notes (203,541)us-gaap_RepaymentOfNotesReceivableFromRelatedParties  
Proceeds from issuance of common stock 382,500us-gaap_ProceedsFromIssuanceOfCommonStock  
Net cash provided by financing activities- continuing operations 326,495us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations  
Net cash provided by financing activities- discontinued operations (698,530)GRST_NetCashProvidedByUsedInFinancingActivitiesDisContinuingOperations  
Net cash provided by financing activities (372,071)us-gaap_NetCashProvidedByUsedInFinancingActivities  
Effect of exchange rate on cash 71,356us-gaap_EffectOfExchangeRateOnCash  
Net increase (decrease) in cash 214,225us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease  
Cash, beginning of year (126,073)us-gaap_Cash  
Cash, end of year 88,152us-gaap_Cash (126,073)us-gaap_Cash
Cash paid for interest 80,531us-gaap_InterestPaid  
Cash paid for income taxes     
Common stock issued as a result of conversion of convertible notes payable 197,730us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities  
Common Stock issued as a result of conversion of short term notes payable 127,076us-gaap_StockIssuedDuringPeriodValueOther 28,792us-gaap_StockIssuedDuringPeriodValueOther
Common stock surrendered as part of disposition of subsidiary (277,500)GRST_SurrenderOfSharesAsPartOfSaleOfSubsidiaryValue  
Scenario, Actual [Member]    
Net loss   (3,277,442)us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Net loss from discontinued operations, net of tax   (250,131)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Net loss from continuing operations   (3,277,442)us-gaap_IncomeLossFromContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Depreciation   183,260us-gaap_Depreciation
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Provision for bad debts   29,511us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Stock compensation   1,249,192us-gaap_ShareBasedCompensation
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Stock issued for services   365,850us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Amortization of beneficial conversion feature   281,475us-gaap_OtherAmortizationOfDeferredCharges
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Accounts receivable   (25,100)us-gaap_IncreaseDecreaseInAccountsReceivable
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Prepaid expenses   (40,885)us-gaap_IncreaseDecreaseInPrepaidExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Accounts payable and accrued liabilities   (234,832)us-gaap_IncreaseDecreaseInAccountsPayable
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Taxes payable   1,034,925us-gaap_IncreaseDecreaseInAccruedTaxesPayable
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Deferred revenue   (108,318)us-gaap_IncreaseDecreaseInDeferredRevenue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Net cash provided by (used in) operating activities- continuing operations   (792,495)us-gaap_NetCashProvidedByUsedInContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Net cash provided by (used in) operating activities- discontinued operations   58,271us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Net cash provided operating activities   (734,224)us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Cash paid for purchase of fixed assets   (115,728)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Net cash used in investing activities   (115,728)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Repayment of notes payable     
Changes in restricted cash   (94,020)us-gaap_IncreaseDecreaseInRestrictedCashAndInvestmentsForOperatingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Proceeds from bank overdraft   126,073us-gaap_ProceedsFromRepaymentsOfBankOverdrafts
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Proceeds from issuance of short term notes   (53,178)us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Repayment of short term notes   (416,361)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Proceeds from issuance of related party notes   733,735us-gaap_ProceedsFromRelatedPartyDebt
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Repayment of related party notes   (99,834)us-gaap_RepaymentOfNotesReceivableFromRelatedParties
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Proceeds from issuance of common stock   77,155us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Net cash provided by financing activities- continuing operations   273,570us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Net cash provided by financing activities- discontinued operations   335,324GRST_NetCashProvidedByUsedInFinancingActivitiesDisContinuingOperations
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Net cash provided by financing activities   608,894us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Effect of exchange rate on cash   311,861us-gaap_EffectOfExchangeRateOnCash
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Net increase (decrease) in cash   70,803us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Cash, beginning of year   (70,803)us-gaap_Cash
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Cash paid for interest   145,523us-gaap_InterestPaid
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Cash paid for income taxes     
Common stock issued as a result of conversion of convertible notes payable   397,298us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember
Common Stock issued as a result of conversion of short term notes payable   $ 0us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioActualMember