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Note 5 - Computation of Net Loss Per Common Share (Tables)
 9 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended December 31,
    
Nine Months Ended December 31,
  
   
2020
    
2019
    
2020
    
2019
  
Numerator:
                                
Net loss
   $
(7,933
 )   $
(6,845
 )   $
(15,062
 )   $
(11,209
 )
Less: decrease in fair value of warrants, net of income tax
    
—
      
(556
 )    
—
      
(4,648
 )
Plus: change in fair value due to exercise of warrants
    
—
      
—
      
—
      
83
  
Net loss - diluted   $
(7,933
 )   $
(7,401
 )   $
(15,062
 )   $
(15,774
 )
Denominator:
                                
Weighted-average shares of common stock outstanding    
26,532
      
22,110
      
24,143
      
21,729
  
Weighted-average shares subject to repurchase    
(1,062
 )    
(925
 )    
(1,132
 )    
(943
 )
Shares used in per-share calculation ― basic    
25,470
      
21,185
      
23,011
      
20,786
  
Common stock warrants    
—
      
18
      
—
      
108
  
Shares used in per-share calculation ― diluted    
25,470
      
21,203
      
23,011
      
20,894
  
Net loss per share ― basic   $
(0.31
 )   $
(0.32
 )   $
(0.65
 )   $
(0.54
 )
Net loss per share ― diluted   $
(0.31
 )   $
(0.35
 )   $
(0.65
 )   $
(0.75
 )