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Note 7 - Fair Value Measurements (Tables)
9 Months Ended
Dec. 31, 2020
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)
 
December 31, 2020:
                               
Assets:
                               
Cash equivalents
  $
56,101
    $
56,101
    $
    $
 
Marketable securities
  $
10,239
    $
10,239
    $
    $
 
Derivative liabilities:                                
Contingent consideration   $
6,730
    $
    $
    $
6,730
 
   
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
   
2,740
 
Balance at December 31, 2020
  $
6,730