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9. Net Loss per Common Share (Tables)
9 Months Ended
Sep. 30, 2014
Notes to Financial Statements  
Loss Per share computation
    Three Month Period Ended     Nine Month Period Ended  
    September 30,     September 30,  
    2014     2013     2014     2013  
Basic and diluted weighted average common stock shares outstanding     12,042,739       5,009,274       9,987,682       5,002,135  
Potentially dilutive securities excluded from loss per share computations:                                
Common stock options     1,384,341       1,410,240       1,384,341       1,410,240  
Common stock purchase warrants     7,428,141       529,018       7,428,141       529,018