Concentrations of credit risk (Details)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Concentrations of credit risk Details
Two customers of gross revenue	61.00%	30.00%
Two customers who comprised of gross revenue	52.00%	27.00%
Company's gross revenue for the periods ended	50.00%	52.00%
Major Vendors
Two vendor purchased of merchandise	81.00%	10.00%
Two vendors which it purchased of merchandise	61.00%	30.00%