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Stock-based compensation (Details Textual) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2012
1998 Stock Option Plan [Member]
Dec. 31, 2011
1998 Stock Option Plan [Member]
Aug. 31, 2008
Director [Member]
Jan. 31, 2013
Director One [Member]
Oct. 31, 2012
Director One [Member]
Jul. 31, 2012
Director One [Member]
Apr. 30, 2012
Director One [Member]
Jan. 31, 2012
Director One [Member]
Dec. 31, 2012
Director Two [Member]
Sep. 30, 2012
Director Two [Member]
Jun. 30, 2012
Director Two [Member]
Mar. 31, 2012
Director Two [Member]
Dec. 31, 2011
Director Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted             85,000   25,000                    
ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1                 1 year                    
Share Based Compensation Arrangement By Share Based Payment Award Exercisable Date             Jul. 31, 2014   Aug. 15, 2009                    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date                 Aug. 15, 2013                    
Exercised, Weighted-Average Exercise Price           $ 0     $ 0.38                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 100,000       150,000 100,000                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number               50,000                      
Class of Warrant or Right, Outstanding             30,000                        
Class of Warrant or Right, Exercise Price of Warrants or Rights             0.63                        
Accrued stock compensation $ 15,625       $ 15,625 $ 15,625                          
Stock Issued During Period, Shares, New Issues 78,126 78,126 78,126 67,936 65,106         31,250 31,250 31,250 27,174 26,042 15,626 15,626 15,626 13,588 13,022
Stock Issued During Period Per Share Value Of New Issues $ 0.20 $ 0.20 $ 0.20 $ 0.23 $ 0.24                            
Stock Issued During Period, Value, New Issues $ 15,625 $ 15,625 $ 15,625 $ 15,625 $ 15,625