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Stock-based compensation (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

For the year ended December 31, 2012, option activity was as follows:

 

    Shares     Weighted-Average
Exercise Price		     Remaining Contractual Term     Aggregate Fair Value  
Outstanding at beginning of year     150,000     $ 0.36                  
Granted     -     $ -                  
Expired and forfeited     (50,000 )   $ 0.3275                  
Exercised     -     $ -                  
Outstanding at end of year     100,000     $ 0.38       0.62     $ 30,120  
                                 
Exercisable at December 31, 2012     100,000     $ 0.38       0.62     $ 30,120  
Schedule Of Stock Option Outstanding [Table Text Block]

As of December 31, 2012, a summary of options outstanding under the Company’s 1998 Plan was as follows:

 

Exercise Price     Weighted-Average Remaining Contractual Life (Years)     Number Outstanding at 12/31/12     Weighted-Average Exercise Price     Number Exercisable at 12/31/12     Weighted-Average Exercise Price  
  0.38       0.62       100,000     $ 0.38       100,000     $ 0.38