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Business Segment Data (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Schedule of segment reporting information, by segment
   (In Thousands)
   Three Months Ended  Nine Months Ended
   September 30,  September 30,
Operations by Segments:  2017  2016  2017  2016
Revenues:            
   Regulated  $32,252   $33,989   $88,023   $89,797 
   Non – Regulated   4,142    3,949    11,755    11,685 
Inter-segment Elimination   (220)   (144)   (459)   (384)
Consolidated Revenues  $36,174   $37,794   $99,319   $101,098 
                     
Operating Income:                    
   Regulated  $12,098   $13,516   $28,195   $30,940 
   Non – Regulated   708    640    1,954    1,845 
Consolidated Operating Income  $12,806   $14,156   $30,149   $32,785 
                     
Net Income:                    
   Regulated  $7,232   $8,154   $16,341   $18,226 
   Non – Regulated   410    659    1,122    1,296 
Consolidated Net Income  $7,642   $8,813   $17,463   $19,522 
                     
Capital Expenditures:                    
  Regulated  $13,998   $14,011   $35,157   $33,961 
   Non – Regulated   7    24    13    185 
Total Capital Expenditures  $14,005   $14,035   $35,170   $34,146 

 

         
   As of  As of  
    September 30,  December 31,  
    2017  2016  
Assets:            
   Regulated  $654,248   $619,915   
   Non – Regulated   6,772    6,245   
Inter-segment Elimination   (9,101)   (5,999)  
Consolidated Assets  $651,919   $620,161