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Note 7 - Accounts Receivable (Tables)
 3 Months Ended
Jun. 30, 2020
Notes Tables  
Accounts Receivable [Table Text Block]
   
June 30, 2020
    
March 31, 2020
  
Accounts receivable (billed)
   $
4,078
     $
11,276
  
Accounts receivable (unbilled)
    
4,125
      
5,711
  
Accounts receivable, net
   $
8,203
     $
16,987