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Note 4 - Computation of Net Loss per Common Share (Tables)
 9 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended December 31,
    
Nine Months Ended December 31,
  
   
2019
    
2018
    
2019
    
2018
  
Numerator:
                                
Net (loss) income
   $
(6,845
 )   $
17,293
     $
(11,209
 )   $
35,114
  
Less: decrease in fair value of warrants, net of income tax    
(556
 )    
0
      
(4,648
 )    
0
  
Plus: change in fair value due to exercise of warrants    
0
      
0
      
83
      
0
  
Net income (loss) - diluted   $
(7,401
 )   $
17,293
     $
(15,774
 )   $
35,114
  
Denominator:
                                
Weighted-average shares of common stock outstanding
    
22,110
      
21,396
      
21,729
      
21,216
  
Weighted-average shares subject to repurchase
    
(925
 )    
(977
 )    
(943
 )    
(916
 )
Shares used in per-share calculation ― basic
    
21,185
      
20,419
      
20,786
      
20,300
  
Common stock awards    
0
      
445
      
0
      
238
  
Common stock warrants    
18
      
0
      
108
      
0
  
Shares used in per-share calculation ― diluted
    
21,203
      
20,864
      
20,894
      
20,538
  
Net (loss) income per share ― basic
   $
(0.32
 )   $
0.85
     $
(0.54
 )   $
1.73
  
Net (loss) income per share ― diluted
   $
(0.35
 )   $
0.83
     $
(0.75
 )   $
1.71