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Note 8 - Accounts Receivable
 9 Months Ended
Dec. 31, 2020
Notes to Financial Statements  
Accounts Receivable [Text Block]
8.
Accounts Receivable
 
Accounts receivable at 
December 31, 2020
and 
March 31, 2020
consisted of the following (in thousands):
 
   
December 31, 2020
    
March 31, 2020
  
Accounts receivable (billed)   $
7,897
     $
11,276
  
Accounts receivable (unbilled)    
4,201
      
5,711
  
Less: Allowance for doubtful accounts    
(15
 )    
—
  
Accounts receivable, net
   $
12,083
     $
16,987
  
 
The Company recorded allowance for doubtful accounts of less than
$0.1
million for the
three
and
nine
 months ended 
December 31, 2020
and
no
allowance for the
three
and
nine
months ended 
December 31, 2019
.  The allowances are based on evaluation of customer accounts that are past due.