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Business Segment Data (Tables)
 9 Months Ended
Sep. 30, 2015
Business Segment Data [Abstract]  
Schedule of segment reporting information, by segment
    (In Thousands)
  Three Months Ended Nine Months Ended
  September 30, September 30,
Operations by Segments:   2015   2014 2015 2014
Revenues:                                
   Regulated   $ 31,120     $ 29,346     $ 83,998     $ 78,719  
   Non – Regulated     3,650       3,492       11,445       10,752  
Inter-segment Elimination     (116 )      (169 )     (343 )     (439 )
Consolidated Revenues   $ 34,654     $ 32,669     $ 95,100     $ 89,032  
                                 
Operating Income:                                
   Regulated   $ 10,938     $ 11,039     $ 25,774     $ 24,585  
   Non – Regulated     522       581       1,604       1,748  
Consolidated Operating Income   $ 11,460     $ 11,620     $ 27,378     $ 26,333  
                                 
Net Income:                                
   Regulated   $ 6,466     $ 6,458     $ 14,653     $ 13,753  
   Non – Regulated   277     300       814       901  
Consolidated Net Income   $ 6,743     $ 6,758     $ 15,467     $ 14,654  
                             
Capital Expenditures:                            
  Regulated   $ 6,613  
$ 7,211     $ 19,232     $ 15,685  
   Non – Regulated   38     67       65       98  
Total Capital Expenditures   $ 6,651     $ 7,278     $ 19,297     $ 15,783  

 

As of As of
September 30, December 31,
2015 2014
Assets:        
   Regulated   $ 600,452     $ 574,854  
   Non – Regulated     6,991       7,252  
Inter-segment Elimination     (4,364 )     (6,334 )
Consolidated Assets   $ 603,079     $ 575,772