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13. Income taxes (Tables)
3 Months Ended
Mar. 31, 2013
Income Tax Disclosure [Abstract]  
Components of Future Tax Assets
   March 31,
2013
  March 31,
2012
  December 31,
2012
Net operating loss carry forward  $10,680,034   $9,089,391   $10,303,902 
Valuation allowance   (10,680,034)   (9,089,391)   (10,303,902)
Net future tax asset  $—     $—     $—   
Income Tax Rate Reconciliation
   March 31,
2013
  March 31,
2012
  December 31,
2012
Tax at statutory rate  $131,646   $80,932   $519,529 
Valuation allowance   (131,646)   (80,932)   (519,529)
Net future tax asset  $—     $—     $—