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Note 12 - Warrants and Derivative Liabilities (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Fiscal Year 2020
 
March 31, 2021
   
December 31, 2020
   
October, 1, 2020
 
Revenue risk premium
   
6.70
%    
6.90
%    
7.10
%
Revenue volatility
   
30
%    
30
%    
30
%
Stock Price
  $
18.96
    $
23.42
    $
14.23
 
Payment delay (days)
   
80
     
80
     
 
Fair value
 
$7.1 million
   
$6.7 million
   
$4.0 million