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Note 7 - Changes in Shareholders' Equity (Tables)
 3 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Stockholders Equity [Table Text Block]
   
Additional
   
 
 
 
   
Paid-In
   
Retained
 
   
Capital
   
Earnings
 
                 
Beginning balance at March 31, 2018:
   $
9,381
     $
106,320
  
Share based compensation
    
719
      
-
  
Dividends declared
    
-
      
(5,151
 )
Net income
    
-
      
12,582
  
                 
Ending balance at June 30, 2018:
   $
10,100
     $
113,751