Quarterly report pursuant to Section 13 or 15(d)

8. Stock options and warrants (Details Narrative)

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8. Stock options and warrants (Details Narrative) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share based compensation     $ 427,172 $ 437,222  
Options          
Options outstanding 21,681,512   21,681,512   21,052,030
Options granted     738,522    
Fair value of options at grant date     $ 296,267    
Aggregate intrinsic value of options outstanding $ 1,565,000   1,565,000    
Share based compensation 178,450 $ 285,923 385,875 401,575  
Future unamortized compensation expense on unvested outstanding options 367,322   367,322    
Warrants          
Share based compensation 20,370 $ 18,376 41,297 $ 35,647  
Aggregate intrinsic value of warrants outstanding 200,667   200,667    
Future unamortized compensation expense on unvested warrants $ 18,250   $ 18,250    
Warrants exercised     200,000    
Proceeds from warrants exercised     $ 50,000    
Warrants expired     100,000    
2004 Stock Option Plan          
Options outstanding 3,544,908   3,544,908   3,544,908