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Note 2 - Summary of Significant Accounting Policies (Tables)
3 Months Ended
Jun. 30, 2017
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
 
 
Three Months Ended
 
             
 
 
June 30, 201
7
 
 
June 30, 201
6
 
International revenues
   
28
%
   
29
%
Domestic revenues
   
72
%
   
71
%
Total revenues
   
100
%
   
100
%