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Shares Reserved (Tables)
12 Months Ended
Dec. 31, 2020
Notes to Financial Statements  
Common stock reserved for future issuance

Common stock reserved for future issuance was as follows:

 

    December 31,
    2020   2019
Stock option grants outstanding (see Note 6)     1,994,806       2,392,786  
Reserved for future grants     393,351       308,871  
      2,388,157       2,701,657