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Note 7 - Accounts Receivable (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Accounts Receivable [Table Text Block]
   
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