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Note 1 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Mar. 31, 2018
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
   
March 31,
 
   
2018
   
2017
   
2016
 
                         
Net income
  $
37,283
    $
23,819
    $
20,567
 
Change in unrealized gain on short term investments, net of taxes
   
-
     
-
     
54
 
                         
Comprehensive income
  $
37,283
    $
23,819
    $
20,621