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Business Segment Data (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
segments
Jun. 30, 2014
USD ($)
Segment Reporting Information [Line Items]        
Number of Reportable Segments | segments     2  
Operating Revenues $ 31,666 $ 29,190 $ 60,446 $ 56,363
Operating Income 9,235 8,747 15,919 14,714
Net Income 5,089 4,728 8,724 7,897
Capital Expenditures 7,761 4,339 12,646 8,505
Assets 586,407   586,407  
Regulated [Member]        
Segment Reporting Information [Line Items]        
Operating Revenues 27,972 25,720 52,878 49,373
Operating Income 8,672 8,144 14,835 13,547
Net Income 4,809 4,416 8,185 7,297
Capital Expenditures 7,734 4,339 12,619 8,474
Assets 582,618   582,618  
Non - Regulated [Member]        
Segment Reporting Information [Line Items]        
Operating Revenues 3,804 3,624 7,795 7,261
Operating Income 563 603 1,084 1,167
Net Income 280 $ 312 539 600
Capital Expenditures 27   27 31
Assets 8,150   8,150  
Inter-segment Elimination [Member]        
Segment Reporting Information [Line Items]        
Operating Revenues (110) $ (154) (227) $ (271)
Assets $ (4,361)   $ (4,361)