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Business Segment Data (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information [Line Items]      
Number of Reportable Segments 2    
Operating Revenues $ 30,579 $ 28,780  
Operating Income 8,302 6,685  
Net Income 4,790 3,636  
Capital Expenditures 6,672 4,885  
Assets 585,963   $ 581,383
Inter-segment Elimination [Member]      
Segment Reporting Information [Line Items]      
Operating Revenues (104) (117)  
Assets (4,199)   (6,374)
Regulated [Member]      
Segment Reporting Information [Line Items]      
Operating Revenues 26,949 24,905  
Operating Income 7,733 6,165  
Net Income 4,492 3,377  
Capital Expenditures 6,660 4,885  
Assets 582,408   581,321
Non - Regulated [Member]      
Segment Reporting Information [Line Items]      
Operating Revenues 3,734 3,992  
Operating Income 569 520  
Net Income 298 $ 259  
Capital Expenditures 12  
Assets $ 7,754   $ 6,436