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6. Accounts Receivable: and other receivable (Details Narrative) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Sale of Subsidiary, Consideration Received $ 488,683GRST_DueOnSaleOfSubsidiary $ 493,806GRST_DueOnSaleOfSubsidiary
Endoscopy Sale Price    
Sale of Subsidiary, Consideration Received 1,282,001GRST_DueOnSaleOfSubsidiary
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= GRST_EndoscopySalePriceMember		  
Purchase Price    
Sale of Subsidiary, Consideration Received 1,250,000GRST_DueOnSaleOfSubsidiary
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= GRST_PurchasePriceMember		  
Acquisition of Assets    
Sale of Subsidiary, Consideration Received $ 32,001GRST_DueOnSaleOfSubsidiary
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= GRST_AcquisitionAssetsMember