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Note 2 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Mar. 31, 2021
Notes Tables  
Property Plant and Equipment Useful Life [Table Text Block]
Asset Classification
  
Estimated Useful Life in Years
  
Machinery and equipment
  
3
-
10
  
Furniture and fixtures
  
3
-
5
  
Leasehold improvements
  
Shorter of the estimated useful life or the remaining lease term
  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Fiscal year ended March 31,
  
   
2021
    
2020
  
Numerator:
                
Net loss
   $
(22,678
 )   $
(17,096
 )
Less: decrease in fair value of warrants, net of income tax    
—
      
(4,648
 )
Plus: change in fair value due to exercise of warrants    
—
      
83
  
Net loss - diluted   $
(22,678
 )   $
(21,662
 )
Denominator:
                
Weighted-average shares of common stock outstanding    
24,991
      
21,937
  
Weighted-average shares subject to repurchase
    
(1,112
 )    
(953
 )
Shares used in per-share calculation ― basic
    
23,879
      
20,985
  
Common stock warrants    
—
      
84
  
Shares used in per-share calculation ― diluted
    
23,879
      
21,069
  
Net loss per share ― basic
   $
(0.95
 )   $
(0.81
 )
Net loss per share ― diluted
   $
(0.95
 )   $
(1.03
 )