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Note 7 - Accounts Receivable (Tables)
 6 Months Ended
Sep. 30, 2020
Notes Tables  
Accounts Receivable [Table Text Block]
   
September 30, 2020
    
March 31, 2020
  
Accounts receivable (billed)   $
10,865
     $
11,276
  
Accounts receivable (unbilled)    
5,968
      
5,711
  
Less: Allowance for doubtful accounts    
(23
 )    
—
  
Accounts receivable, net
   $
16,810
     $
16,987