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Note 4 - Computation of Net Loss Per Common Share (Tables)
 6 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended September 30,
    
Six Months Ended September 30,
  
   
2020
    
2019
    
2020
    
2019
  
Numerator:
                                
Net loss
   $
(3,712
 )   $
(825
 )   $
(7,129
 )   $
(4,364
 )
Less: decrease in fair value of warrants, net of income tax
    
—
      
(1,145
 )    
—
      
(4,092
 )
Plus: change in fair value due to exercise of warrants
    
—
      
—
      
—
      
83
  
Net income (loss) - diluted
   $
(3,712
 )   $
(1,970
 )   $
(7,129
 )   $
(8,373
 )
Denominator:
                                
Weighted-average shares of common stock outstanding
    
23,057
      
21,678
      
22,943
      
21,538
  
Weighted-average shares subject to repurchase
    
(1,197
 )    
(1,022
 )    
(1,168
 )    
(952
 )
Shares used in per-share calculation ― basic
    
21,860
      
20,656
      
21,775
      
20,586
  
Common stock warrants
    
—
      
67
      
—
      
150
  
Shares used in per-share calculation ― diluted
    
21,860
      
20,723
      
21,775
      
20,736
  
Net loss per share ― basic
   $
(0.17
 )   $
(0.04
 )   $
(0.33
 )   $
(0.21
 )
Net loss per share ― diluted
   $
(0.17
 )   $
(0.10
 )   $
(0.33
 )   $
(0.40
 )