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Note 7 - Accounts Receivable
 12 Months Ended
Mar. 31, 2021
Notes to Financial Statements  
Accounts Receivable [Text Block]
7.
Accounts Receivable
 
Accounts receivable at 
March 31, 2021
and 
March 31, 2020
consisted of the following (in thousands):
 
   
March 31, 2021
    
March 31, 2020
  
Accounts receivable (billed)
   $
7,502
     $
11,276
  
Accounts receivable (unbilled)    
5,765
      
5,711
  
Accounts receivable
   $
13,267
     $
16,987