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Note 7 - Net Income Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
  

Three Months Ended

September 30,

      

Nine Months Ended

September 30,

 
  

2020

  

2019

  

2020

  

2019

 

Net loss

 $(2,526) $(6,150) $(9,383) $(17,866)

Weighted-average number of common shares—basic and diluted

  29,037,074   41,019,230   31,345,760   38,190,584 

Net loss per share—basic and diluted

 $(0.09) $(0.15) $(0.30) $(0.47)