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Note 4 - Computation of Net Loss per Common Share (Tables)
 6 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended September 30,
    
Six Months Ended September 30,
  
   
2019
    
2018
    
2019
    
2018
  
Numerator:
                                
Net (loss) income
   $
(825
 )   $
22,558
     $
(4,364
 )   $
17,821
  
Less: decrease in fair value of warrants, net of income tax    
(1,145
 )    
0
      
(4,092
 )    
0
  
Plus: change in fair value due to exercise of warrants    
0
      
0
      
83
      
0
  
Net income (loss) - diluted   $
(1,970
 )   $
22,558
     $
(8,373
 )   $
17,821
  
Denominator:
                                
Weighted-average shares of common stock outstanding
    
21,678
      
21,252
      
21,538
      
21,126
  
Weighted-average shares subject to repurchase
    
(1,022
 )    
(939
 )    
(952
 )    
(886
 )
Shares used in per-share calculation ― basic
    
20,656
      
20,313
      
20,586
      
20,240
  
Common stock awards    
0
      
268
      
0
      
320
  
Common stock warrants    
67
      
0
      
150
      
0
  
Shares used in per-share calculation ― diluted
    
20,723
      
20,581
      
20,736
      
20,560
  
Net (loss) income per share ― basic
   $
(0.04
 )   $
1.11
     $
(0.21
 )   $
0.88
  
Net (loss) income per share ― diluted
   $
(0.10
 )   $
1.10
     $
(0.40
 )   $
0.87