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10. Related party transactions (Details Narrative) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Related Party Notes Payable $ 76,734us-gaap_NotesPayableRelatedPartiesClassifiedCurrent   $ 51,336us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
Management Fees 48,368us-gaap_FeesAndCommissions 45,320us-gaap_FeesAndCommissions  
Rent Expense 88,755us-gaap_LeaseAndRentalExpense 177,381us-gaap_LeaseAndRentalExpense  
Greenestone Clinic      
Related Party Notes Payable 47,265us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= GRST_GreenestoneClinicMember
  84,736us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= GRST_GreenestoneClinicMember
Due to Related Party $ 80,000us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= GRST_GreenestoneClinicMember