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Quarterly Operating Results - Unaudited (Tables)
 12 Months Ended
Dec. 31, 2014
Quarterly Operating Results - Unaudited [Abstract]  
Quarterly financial information

Operating results for each quarter of 2014 and 2013 are as follows:

  


    (Thousands of Dollars, Except per Share Data)
2014   1st   2nd   3rd   4th   Total
                     
Operating Revenues   $ 27,173     $ 29,190     $ 32,669     $ 28,107     $ 117,139  
Operating Income     5,967       8,747       11,620       8,058       34,392  
Net Income     3,169       4,728       6,758       3,790       18,445  
Basic Earnings per Share   $ 0.20     $ 0.29     $ 0.42     $ 0.23     $ 1.14  
Diluted Earnings per Share   $ 0.20     $ 0.29     $ 0.42     $ 0.22     $ 1.13  

 

2013   1st   2nd   3rd   4th   Total
                                         
Operating Revenues   $ 27,038     $ 29,102     $ 31,285     $ 27,421     $ 114,846  
Operating Income     5,865       8,171       10,270       6,664       30,970  
Net Income     3,177       4,481       5,807       3,168       16,633  
Basic Earnings per Share   $ 0.20     $ 0.28     $ 0.36     $ 0.20     $ 1.04  
Diluted Earnings per Share   $ 0.20     $ 0.28     $ 0.36     $ 0.19     $ 1.03