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Shares Reserved (Tables)
 12 Months Ended
Dec. 31, 2013
Notes to Financial Statements  
Common stock reserved for future issuance
   December 31,
   2013  2012
Stock option grants outstanding (see Note 7)    1,659,170    1,624,188 
Reserved for future stock option grants (see Note 7)    215,898    62,438 
Reserved for note conversion (see Note 2)    1,050,325    620,844 
Reserved for exercise of outstanding warrants (see Note 11)    1,033,776    607,776 
    3,959,169    2,915,246