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Note 8 - Concentrations (Tables)
12 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   

% of Revenue for
Year Ended March 31

 
   

2022

   

2021

 

Customer A

    25

%

    22

%

Customer B

    11

%

    15

%