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Note 5 - Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

Three Months Ended March 31,

 
   

2020

   

2019

 

Anti-dilutive securities:

               

Stock options

    2,316       2,782