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Note 4 - Computation of Net Loss per Common Share (Tables)
 3 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended June 30,
  
   
2020
    
2019
  
Numerator:
                
Net loss
   $
(3,417
 )   $
(3,539
 )
Denominator:
                
Weighted-average shares of common stock outstanding
    
22,827
      
21,499
  
Weighted-average shares subject to repurchase
    
(1,138
 )    
(985
 )
Shares used in per-share calculation ― basic
    
21,689
      
20,514
  
Shares used in per-share calculation ― diluted
    
21,689
      
20,514
  
Net loss per share ― basic
   $
(0.16
 )   $
(0.17
 )
Net loss per share ― diluted
   $
(0.16
 )   $
(0.17
 )