8. Income Taxes (Details 1)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes Details 1
Statutory U.S. income tax rate	34.00%	34.00%	34.00%
States taxes, net of federal benefit	1.50%	0.58%	0.44%
Permanent differences	1.04%	11.07%	19.00%
Change in valuation allowance	(8.19%)	(9.13%)	52.00%
Change in net operating loss carryforwards and tax credits	0.30%	(3.36%)	(33.20%)
Other	(0.33%)	0.42%	1.70%
Effective income tax rate	28.32%	35.58%	1.10%