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Business Segment Data (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information [Line Items]          
Number of Reportable Segments     2    
Operating Revenues $ 37,794 $ 34,654 $ 101,098 $ 95,100  
Operating Income 14,156 11,460 32,785 27,378  
Net Income 8,813 6,743 19,522 15,467  
Capital Expenditures 14,035 7,761 34,146 19,297  
Assets 612,448   612,448   $ 581,383
Regulated [Member]          
Segment Reporting Information [Line Items]          
Operating Revenues 33,989 31,120 89,797 83,998  
Operating Income 13,516 10,938 30,940 25,774  
Net Income 8,154 6,466 18,226 14,653  
Capital Expenditures 14,011 6,613 33,961 19,232  
Assets 611,400   611,400   581,321
Non - Regulated [Member]          
Segment Reporting Information [Line Items]          
Operating Revenues 3,949 3,650 11,685 11,445  
Operating Income 640 522 1,845 1,604  
Net Income 659 277 1,296 814  
Capital Expenditures 24 38 185 65  
Assets 7,047   7,047   6,436
Inter-segment Elimination [Member]          
Segment Reporting Information [Line Items]          
Operating Revenues (144) $ (116) (384) $ (343)  
Assets $ (5,999)   $ (5,999)   $ (6,374)