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5. Financial instruments (Details Narrative) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Investments, All Other Investments [Abstract]    
Working Capital Deficiency $ (3,005,903)us-gaap_OtherAdditionalCapital  
Accumulated Deficit (19,921,658)us-gaap_RetainedEarningsAccumulatedDeficit  
Liquidity Risk Associated with Bank Overdraft 9,758us-gaap_BorrowingsUnderGuaranteedInvestmentAgreements   
Potential Increase Decrease in Company's After Tax Loss $ 17,000GRST_PotentialIncreaseDecreaseInCompanysAfterTaxLoss