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13. Related party transactions (Details Narrative) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Related Party Notes Payable $ 51,336us-gaap_NotesPayableRelatedPartiesClassifiedCurrent  
Management Fees 122,271us-gaap_FeesAndCommissions 194,180us-gaap_FeesAndCommissions
Rent Expense 412,488us-gaap_LeaseAndRentalExpense 454,381us-gaap_LeaseAndRentalExpense
Greenestone Clinic    
Related Party Notes Payable $ 84,736us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= GRST_GreenestoneClinicMember		 $ 205,995us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= GRST_GreenestoneClinicMember