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Note 6 - Fair Value Measurements (Tables)
12 Months Ended
Mar. 31, 2021
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)
 
March 31, 2021:
                               
Assets:
                               
Cash equivalents   $
54,104
    $
54,104
    $
    $
 
Marketable securities
  $
5,141
    $
5,141
    $
    $
 
Derivative liabilities:                                
Contingent Consideration   $
7,050
    $
    $
    $
7,050
 
   
Total Carrying Value
   
Quoted Prices in Active Markets (Level 1)
   
Significant Other Observable Inputs (Level 2)
   
Significant Unobservable Inputs (Level 3)
 
March 31, 2020:
                               
Assets:
                               
Cash equivalents
  $
19,394
    $
19,394
    $
    $
 
Marketable securities
  $
35,195
    $
35,195
    $
    $
 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Acquisition Contingent Consideration
 
April 1, 2020
  $
-
 
Issuance of contingent consideration
   
3,990
 
Mark to market adjustment
   
3,060
 
March 31, 2021
  $
7,050
 
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
   
Warrants
 
April 1, 2019
  $
4,942
 
Mark to market adjustment
   
(4,648
)
Exercise of in-the-money warrants
   
(294
)
March 31, 2020
  $
-