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Note 7 - Accounts Receivable
 3 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Accounts Receivable [Text Block]
7.
Accounts Receivable
 
Accounts receivable at 
June 30, 2019
and 
March 31, 2019
consisted of the following (in thousands):
 
   
June 30, 2019
   
March 31, 2019
 
Accounts receivable (billed)
   $
8,643
     $
5,642
  
Accounts receivable (unbilled)
    
2,093
      
2,213
  
Accounts receivable, net
   $
10,736
     $
7,855