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Note 7 - Accounts Receivable (Tables)
 9 Months Ended
Dec. 31, 2019
Notes Tables  
Accounts Receivable [Table Text Block]
   
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