19. Income taxes (Details 2) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Income Taxes Details
Federal credit at statutory rate	$ (4,846,180)	$ (5,415,468)
State tax, net of Federal benefit	(782,767)	(926,363)
Change in valuation allowance	5,495,845	6,338,928
Other	133,102	2,903
Total provision
Federal credit at statutory rate Percent	166.75%	258.71%
State tax, net of Federal benefit Percent	26.93%	44.25%
Change in valuation allowance Percent	(189.11%)	(302.82%)
Other Percent	(4.58%)	(0.14%)
Total provision Percent	0.00%	0.00%