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Note 7 - Accounts Receivable
 9 Months Ended
Dec. 31, 2019
Notes to Financial Statements  
Accounts Receivable [Text Block]
7.
Accounts Receivable
 
Accounts receivable at 
December 31, 2019
and 
March 31, 2019
consisted of the following (in thousands):
 
   
December 31, 2019
    
March 31, 2019
  
Accounts receivable (billed)
   $
11,878
     $
5,642
  
Accounts receivable (unbilled)
    
4,613
      
2,213
  
Accounts receivable, net
   $
16,491
     $
7,855