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16. Discontinued operations - 1816191 Ontario Limited (1816191) (Details Narrative) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Reduction to APIC $ 45,000us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature $ 90,452us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature
1816191 Ontario Limited    
Sale of Entity 1,282,002us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_DisposalGroupClassificationAxis
= GRST_OntarioLimited1816191Member
 
Assumed Debt 895,495us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
/ us-gaap_DisposalGroupClassificationAxis
= GRST_OntarioLimited1816191Member
 
Reduction to APIC 1,104,304us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature
/ us-gaap_DisposalGroupClassificationAxis
= GRST_OntarioLimited1816191Member
 
Reduction to Comprehensive Income $ 90,304us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax
/ us-gaap_DisposalGroupClassificationAxis
= GRST_OntarioLimited1816191Member