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Note 8 - Accounts Receivable (Tables)
 9 Months Ended
Dec. 31, 2020
Notes Tables  
Accounts Receivable [Table Text Block]
   
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