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Options and warrants (Detail Textuals 1) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Proceeds from stock options and warrants exercised $ 0 $ 0
Share-based compensation expense 0 200,000
Share-based compensation cost not yet recognized 57,000  
Period for Recognition 3 years  
Warrant
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of warrants issued in conjunction with common stock   800,000
Exercise price of warrants   0.30
Stock Options
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate intrinsic value of options outstanding $ 0.012 $ 0.04
Aggregate intrinsic value of options outstanding 0 0
Aggregate intrinsic value of options exercisable $ 0 $ 0