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Note 12 - Quarterly Financial Information (Unaudited, in Thousands, Except Share and Per Share Data)
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Quarterly Financial Information [Text Block]
12.
  
Quarterly Financial Information (unaudited, in thousands, except share and per share data)
 
The following table contains selected quarterly financial information from
2018
and
2017.
The Company believes that the following information reflects all normal recurring adjustments necessary for a fair statement of the information for the periods presented. The operating results for any quarter are
not
necessarily indicative of results for any future period.
 
    Three Months Ended (a)
    March 31,   June 30,   September 30,   December 31,
    2018   2018   2018   2018
Operating expenses   $
6,365
     $
5,000
     $
4,622
     $
5,385
  
Net loss attributable to common stockholders    
(6,081
 )    
(4,879
 )    
(4,510
 )    
(5,259
 )
Net loss per share attributable to common stockholders:                                
Basic and Diluted   $
(0.34
 )   $
(0.28
 )   $
(0.25
 )   $
(0.27
 )
Weighted-average common shares outstanding used in net loss per share attributable to common stockholders:                                
Basic and Diluted    
17,674,729
      
17,674,729
      
17,824,186
      
19,221,292
  
 
    Three Months Ended (a)
    March 31,   June 30,   September 30,   December 31,
    2017   2017   2017   2017
Operating expenses   $
6,480
     $
5,986
     $
12,306
 
   $
5,590
  
Net loss attributable to common stockholders    
(6,498
 )    
(5,608
 )    
(19,054
)
    
(5,551
 )
Net loss per share attributable to common stockholders:                                
Basic and Diluted   $
(0.39
 )   $
(0.33
 )   $
(1.08
)
   $
(0.33
 )
Weighted-average common shares outstanding used in net loss per share attributable to common stockholders:                                
Basic and Diluted    
16,636,201
      
17,207,672
      
17,619,418
(b)
    
17,619,418
  
__________________
(a) The amounts were computed independently for each quarter, and the sum of the quarters
may
not
total the annual amounts.
(b) Adjusted to correct an immaterial error in the weighted-average share calculation in the Company's Form
10
-Q as of
September 30, 2017.