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Note 6 - Fair Value Measurements (Tables)
6 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Total Carrying Value
   
Quoted Prices in Active Markets (Level 1)
   
Significant Other Observable Inputs (Level 2)
   
Significant Unobservable Inputs (Level 3)
 
September 30, 2019:
                               
Assets:
                               
Cash equivalents
  $
49,034
    $
49,034
    $
    $
 
Marketable securities   $
10,000
    $
10,000
    $
    $
 
Derivative liabilities:
                               
Warrants
  $
556
    $
    $
    $
556
 
   
Total Carrying Value
   
Quoted Prices in Active Markets (Level 1)
   
Significant Other Observable Inputs (Level 2)
   
Significant Unobservable Inputs (Level 3)
 
March 31, 2019:
                               
Assets:
                               
Cash equivalents
  $
41,839
    $
41,839
    $
    $
 
Derivative liabilities:
                               
Warrants
  $
4,942
    $
    $
    $
4,942
 
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
   
Warrants
 
April 1, 2019
  $
4,942
 
Mark to market adjustment
   
(4,092
)
Warrant exercise    
(294
)
Balance at September 30, 2019
  $
556
 
   
Warrants
 
April 1, 2018
  $
1,217
 
Mark to market adjustment
   
182
 
Balance at September 30, 2018
  $
1,399