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Note 7 - Concentrations (Tables)
12 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
   
% of Revenue
for Year
Ended
March 31
 
   
2019
   
2018
 
Customer A
   
21
%    
18
%
Customer B
   
18
%    
19
%