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Note 4 - Earnings (Loss) Per Share (Tables)
 9 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
December 31,
    
December 31,
  
   
2017
    
2018
    
2017
    
2018
  
Net income (loss)
   $
(93,212
 )   $
74,297
     $
(26,910
 )   $
202,329
  
Computation of Basic EPS:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Weighted Average Shares Outstanding used in Computing Basic EPS
    
168,313
      
168,795
      
168,216
      
168,679
  
Basic earnings (loss) per share
   $
(0.55
 )   $
0.44
     $
(0.16
 )   $
1.20
  
Computation of Diluted EPS:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Weighted Average Shares Outstanding used in Computing Basic EPS
    
168,313
      
168,795
      
168,216
      
168,679
  
Effect of stock awards
    
-
      
519
      
-
      
568
  
Weighted Average Shares used in Computing Diluted EPS
(1)
    
168,313
      
169,314
      
168,216
      
169,247
  
Diluted earnings (loss) per share
   $
(0.55
 )   $
0.44
     $
(0.16
 )   $
1.20