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Note 8 - Stockholders' Equity (Tables)
 12 Months Ended
Mar. 31, 2018
Notes Tables  
Dividends Declared [Table Text Block]
   
Year E
nded March 31,
  
   
201
8
    
201
7
    
201
6
  
First quarter
   $
0.16
     $
0.16
     $
0.16
  
Second quarter
    
0.16
      
0.16
      
0.16
  
Third quarter
    
0.16
      
0.16
      
0.16
  
Fourth quarter
    
0.16
      
0.16
      
0.16