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7. Accounts receivable - Accounts Receivable (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Reserve for Doubtful accounts $ 27,294us-gaap_AllowanceForDoubtfulAccountsReceivable $ 28,578us-gaap_AllowanceForDoubtfulAccountsReceivable
Accounts Receivable 164,832us-gaap_AccountsAndNotesReceivableNet 194,503us-gaap_AccountsAndNotesReceivableNet
Treatment Program [Member]    
Accounts Receivable 175,585us-gaap_OtherReceivables
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= GRST_TreatmentProgramMember
134,291us-gaap_OtherReceivables
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= GRST_TreatmentProgramMember
Outpatient Services [Member]    
Accounts Receivable $ 16,541us-gaap_OtherReceivables
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= GRST_OutpatientServicesMember
$ 88,790us-gaap_OtherReceivables
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= GRST_OutpatientServicesMember