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Note 7 - Changes in Shareholders' Equity and Comprehensive Income (Tables)
 9 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   
Additional
Paid-In
Capital
   
Retained
Earnings
 
                 
Beginning balance at March 31, 2018:
   $
9,381
     $
106,320
  
Share based compensation
    
2,312
      
-
  
Dividends declared
    
-
      
(16,306
 )
Net income
    
-
      
31,121
  
                 
Ending balance at December 31, 2018:
   $
11,693
     $
121,135