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Note 8 - Concentrations (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   
% of Revenue for

Year Ended March 31
 
   
2021
   
2020
 
Customer A
   
22%
     
24%
 
Customer B
   
15%
     
14%
 
Customer C
 
Less than 10%
     
10%