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9. Taxes payable - Taxes Payable (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Harmonized sales tax	$ 548,093GRST_HarmonizedSalesTax	$ 590,920GRST_HarmonizedSalesTax
Payroll taxes	2,035,519us-gaap_AccruedPayrollTaxesCurrent	2,065,377us-gaap_AccruedPayrollTaxesCurrent
US tax penalties	150,000	150,000
Taxes Payable	$ 2,733,612us-gaap_AccruedIncomeTaxes	$ 2,806,297us-gaap_AccruedIncomeTaxes

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.

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