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Note 8 - Concentrations (Tables)
12 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   
% of Revenue for
Year Ended March 31
 
   
2020
   
2019
 
Customer A
   
24%
     
21%
 
Customer B
   
14%
     
18%
 
Customer C
   
10%
   
Less than 10%