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Shareholders Equity (USD $)
Common Stock
Additional Paid-In Capital
Comprehensive Income / Loss
Accumulated Deficit
Total
Beginning Balance, Value at Dec. 31, 2012 $ 272,343us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 10,702,191us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (47,726)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
$ (14,138,183)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (3,211,375)us-gaap_StockholdersEquity
Beginning Balance, Shares at Dec. 31, 2012 27,234,279us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Common stock issued for convertible note, Shares 10,031,303us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Common stock issued for convertible note, Value 100,313us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1,379,652us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      1,479,965us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
Common stock issued for short term note, Shares 800,000us-gaap_StockIssuedDuringPeriodSharesOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Common stock issued for short term note, Value 8,000us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
20,792us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    28,792us-gaap_StockIssuedDuringPeriodValueOther
Shares issued for cash, Shares 1,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Shares issued for cash, Value 15,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
112,500us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    127,500us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of shares for services, Shares 1,500,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Issuance of shares for services, Value 15,000us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
365,850us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    380,850us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Stock option compensation   1,249,192us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    1,249,192us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Beneficial conversion feature of debt issuances   90,452us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    90,452us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature
Foreign currency translation      311,861us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
   311,861us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent
Net loss         (3,527,573)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(3,527,573)us-gaap_NetIncomeLoss
Ending Balance, Value at Dec. 31, 2013 410,656us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
13,920,629us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
264,135us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
(17,665,756)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(3,070,336)us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2013 41,065,582us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Surrender of shares as part of sale of subsidiary, Shares (2,408,268)GRST_SurrenderOfSharesAsPartOfSaleOfSubsidiaryShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Surrender of shares as part of sale of subsidiary, Value (24,083)GRST_SurrenderOfSharesAsPartOfSaleOfSubsidiaryValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(253,417)GRST_SurrenderOfSharesAsPartOfSaleOfSubsidiaryValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    (277,500)GRST_SurrenderOfSharesAsPartOfSaleOfSubsidiaryValue
Disposition of subsidiary   1,104,407us-gaap_GainOrLossOnSaleOfStockInSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(90,304)us-gaap_GainOrLossOnSaleOfStockInSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
  1,014,103us-gaap_GainOrLossOnSaleOfStockInSubsidiary
Common stock issued for convertible note, Shares 728,459us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      197,730us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
Common stock issued for convertible note, Value 7,285us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
190,445us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    197,730us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
Common stock issued for short term note, Shares 2,245,991us-gaap_StockIssuedDuringPeriodSharesOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Common stock issued for short term note, Value 22,460us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
104,616us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    127,076us-gaap_StockIssuedDuringPeriodValueOther
Shares issued for cash, Shares 4,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Shares issued for cash, Value 45,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
337,500us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    382,500us-gaap_StockIssuedDuringPeriodValueNewIssues
Stock option compensation   679,858us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    679,858us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Beneficial conversion feature of debt issuances   45,000us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    45,000us-gaap_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature
Foreign currency translation      71,356us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
   71,356us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent
Net loss         (1,900,273)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(1,900,273)us-gaap_NetIncomeLoss
Ending Balance, Value at Dec. 31, 2014 $ 461,318us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 16,129,038us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 245,187us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
$ (19,566,029)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (2,730,486)us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2014 46,131,764us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember