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Note 5 - Goodwill (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Goodwill [Table Text Block]
   
 
Goodwill
 
March 31, 2020
  $
1,719
 
NEPSI Acquisition
   
32,915
 
March 31, 2021
  $
34,634