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Note 2 - Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Sep. 30, 2017
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
Sept
ember 30,
2017
    
Sept
ember 30,
2016
    
Sept
ember 30,
2017
    
Sept
ember 30,
2016
  
International revenues
    
33
%
    
26
%
    
30
%
    
28
%
Domestic revenues
    
67
%
    
74
%
    
70
%
    
72
%
Total revenues
    
100
%
    
100
%
    
100
%
    
100
%