Commitments and contingencies (Details) (USD $)	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Operating lease are recorded as rental expense and totaled	$ 50,662	$ 49,077

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

No definition available.

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration