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15. Warrants and Options (Details Narrative) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Warrants Issued 1,500,000us-gaap_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationWarrantsIssued1 4,500,000us-gaap_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationWarrantsIssued1
Exercise Price, Warrants $ 0.15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 0.15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Aftercare    
Options Granted 3,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= GRST_AfterCareMember
 
Options Granted, Value $ 312,248us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= GRST_AfterCareMember
 
Options Granted, Exercise Price $ 0.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= GRST_AfterCareMember
 
Investor Relations Firm    
Options Granted 300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= GRST_InvestorRelationsFirmMember
 
Options Granted, Value 34,418us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= GRST_InvestorRelationsFirmMember
 
Options Granted, Exercise Price $ 0.00333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= GRST_InvestorRelationsFirmMember
 
CFO    
Options Granted 480,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= GRST_CFOMember
 
Options Granted, Value $ 20,844us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= GRST_CFOMember
 
Options Granted, Exercise Price $ 0.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= GRST_CFOMember