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11. Stockholders deficit (Details Narrative) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Common Stock Par Value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common Stock Shares Authorized 500,000,000us-gaap_CommonStockSharesAuthorized   500,000,000us-gaap_CommonStockSharesAuthorized
Common Stock Shares Issued 46,678,855us-gaap_CommonStockSharesIssued   46,131,764us-gaap_CommonStockSharesIssued
Common Stock Shares Outstanding 46,678,855us-gaap_CommonStockSharesOutstanding   46,131,764us-gaap_CommonStockSharesOutstanding
Preferred Stock Par Value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare   $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock Shares Authorized 10,000,000us-gaap_PreferredStockSharesAuthorized   10,000,000us-gaap_PreferredStockSharesAuthorized
Stock Issued, Promissory Note, Shares 300,000us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits    
Stock Issued, Promissory Note, Value $ 8,117us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments    
Stock Issued, Currency Exchange, Shares 2,909us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment    
Stock Issued, Services, Shares 250,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices    
Stock Issued, Services, Value 56,906us-gaap_StockIssuedDuringPeriodValueIssuedForServices     
Aftercare      
Options Granted     3,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= GRST_AfterCareMember
Options Granted, Value     312,248us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= GRST_AfterCareMember
Options Granted, Exercise Price     $ 0.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= GRST_AfterCareMember
Investor Relations      
Options Granted     300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= GRST_InvestorRelationsFirmMember
Options Granted, Value     34,418us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= GRST_InvestorRelationsFirmMember
Options Granted, Exercise Price     $ 0.00333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= GRST_InvestorRelationsFirmMember
CFO      
Options Granted     480,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_ChiefFinancialOfficerMember
Options Granted, Value     20,844us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_ChiefFinancialOfficerMember
Options Granted, Exercise Price     $ 0.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodIntrinsicValue
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_ChiefFinancialOfficerMember
Preferred Class A [Member]      
Preferred Stock Par Value $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredClassAMember
  $ 1.0us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredClassAMember
Preferred Stock Shares Authorized 3,000,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredClassAMember
  3,000,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredClassAMember
Preferred Class B [Member]      
Preferred Stock Par Value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredClassBMember
  $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredClassBMember
Preferred Stock Shares Authorized 10,000,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredClassBMember
  10,000,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredClassBMember
Stock Issued, Services, Shares 106,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredClassBMember
   
Stock Issued, Services, Value $ 31,906us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredClassBMember