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Shareholders Equity (Unaudited) (USD $)
Preferred Stock "B"
Common Stock
Additional Paid-In Capital
Comprehensive Income / Loss
Accumulated Deficit
Total
Beginning 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
Beginning 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
       
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
       
Common stock issued for convertible note, Shares           8,117us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
Shares issued for debt conversion, Shares    300,000us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      300,000us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits
Shares issued for debt conversion, Value   3,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
5,117us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      8,117us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments
Shares issued for services, Shares 106,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember
250,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      250,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Shares issued for services, Value 1,060us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember
2,500us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
53,346us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      56,906us-gaap_StockIssuedDuringPeriodValueIssuedForServices
Adjustments to previously issued shares for debt conversion, due to exchange adjustments, Shares    (2,909)us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      2,909us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Adjustments to previously issued shares for debt conversion, due to exchange adjustments, Value    (29)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(427)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      (456)us-gaap_AdjustmentsToAdditionalPaidInCapitalOther
Foreign currency translation        315,178us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
   315,178us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent
Net loss           (355,629)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(355,629)us-gaap_NetIncomeLoss
Ending Balance, Value at Mar. 31, 2015 $ 1,060us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember
$ 466,789us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 16,187,074us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 560,365us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ComprehensiveIncomeMember
$ (19,921,658)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (2,706,370)us-gaap_StockholdersEquity
Ending Balance, Shares at Mar. 31, 2015 106,000us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesBPreferredStockMember
46,678,855us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember