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Note 6 - Changes in Shareholders' Equity and Comprehensive Income (Tables)
9 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   
Additional
   
 
 
 
   
Paid-In
   
Retained
 
   
Capital
   
Earnings
 
                 
Beginning balance at March 31, 2017:
  $
6,806
    $
86,530
 
Share based compensation
   
1,858
     
-
 
Dividends declared
   
-
     
(12,343
)
Net income
   
-
     
27,100
 
                 
Ending balance at December 31, 2017:
  $
8,664
    $
101,287