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Note 2 - Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Dec. 31, 2017
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
   
Three Months Ended
    
Nine
Months Ended
  
   
Dec
ember 31,
2017
    
Dec
ember 31,
2016
    
Dec
ember 31,
2017
    
Dec
ember 31,
2016
  
International revenues
    
35
%
    
27
%
    
32
%
    
27
%
Domestic revenues
    
65
%
    
73
%
    
68
%
    
73
%
Total revenues
    
100
%
    
100
%
    
100
%
    
100
%