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Stock-based compensation (Details Textual) (USD $)
 0 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Jul. 14, 2014
Jan. 09, 2014
Apr. 25, 2014
Jun. 30, 2014
Dec. 31, 2013
Jul. 30, 2014
Subsequent Event [Member]
May 31, 2014
Four Directors [Member]
Aug. 31, 2008
Four Directors [Member]
May 31, 2014
Chief Financial Officer [Member]
Jul. 14, 2014
Two Directors [Member]
Jan. 09, 2014
Two Directors [Member]
Apr. 25, 2014
Two Directors [Member]
Jun. 30, 2014
Two Directors [Member]
Class of Warrant or Right, Outstanding           30,000              
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 0.63              
Common Stock Value To Be Issued       $ 12,500 $ 12,500               $ 12,500
Stock Issued During Period, Shares, New Issues 78,126 78,126 73,530             39,063 39,063 36,765  
Stock Issued During Period Per Share Value Of New Issues $ 0.16 $ 0.16 $ 0.17                    
Stock Issued During Period, Value, New Issues 12,500 12,500 12,500                    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted             25,000 25,000 100,000        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price       $ 0     $ 0.17            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number       200,000 0                
Allocated Share-based Compensation Expense       $ 15,000