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8. Fixed assets - Fixed Assets (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Cost $ 567,514us-gaap_AcquisitionCostsCumulative  
Accumulated Amortization 310,971us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Net Book Value 256,543us-gaap_PropertyPlantAndEquipmentFairValueDisclosure 283,246us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
Computer Equipment    
Cost 20,371us-gaap_AcquisitionCostsCumulative
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
 
Accumulated Amortization 13,019us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
 
Net Book Value 7,352us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
11,118us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Furniture and Equipment    
Cost 335,684us-gaap_AcquisitionCostsCumulative
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
 
Accumulated Amortization 221,378us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
 
Net Book Value 114,306us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
179,850us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Medical Equipment    
Cost 4,490us-gaap_AcquisitionCostsCumulative
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= GRST_MedicalEquipmentMember
 
Accumulated Amortization 3,100us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= GRST_MedicalEquipmentMember
 
Net Book Value 1,391us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= GRST_MedicalEquipmentMember
1,961us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= GRST_MedicalEquipmentMember
Vehicles    
Cost 64,175us-gaap_AcquisitionCostsCumulative
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
 
Accumulated Amortization 24,152us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
 
Net Book Value 40,023us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
45,520us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
Leasehold Improvements    
Cost 142,793us-gaap_AcquisitionCostsCumulative
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
 
Accumulated Amortization 49,322us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
 
Net Book Value $ 93,471us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
$ 44,797us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember