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Business Segment Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
N
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Number of Reportable Segments                 2    
Operating Revenues $ 27,421 $ 31,285 $ 29,102 $ 27,038 $ 27,079 $ 32,353 $ 27,401 $ 23,546 $ 114,846 $ 110,379 $ 102,069
Operating Income 6,664 10,270 8,171 5,865 5,717 10,843 7,210 3,877 30,970 27,647 24,201
Depreciation                 10,988 10,409 9,746
Total Other Income, net                 91 857 2,149
Interest Charges                 5,807 6,725 6,376
Income Taxes                 8,621 7,383 6,527
Net Income 3,168 5,807 4,481 3,177 2,726 6,138 3,725 1,807 16,633 14,396 13,447
Capital Expenditures                 20,080 21,578 23,562
Assets 530,341       561,726       530,341 561,726  
Regulated
                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 100,910 98,021 91,729
Operating Income                 28,744 25,944 22,760
Depreciation                 10,807 10,241 9,601
Total Other Income, net                 828 1,489 1,982
Interest Charges                 5,807 6,725 6,376
Income Taxes                 7,635 6,579 5,548
Net Income                 15,504 13,500 12,088
Capital Expenditures                 19,894 21,149 23,125
Assets 529,381       560,165       529,381 560,165  
Non - Regulated
                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 14,463 12,851 10,805
Operating Income                 2,226 1,703 1,441
Depreciation                 181 168 145
Total Other Income, net                 (14) 94 896
Interest Charges                 97 96 97
Income Taxes                 986 804 979
Net Income                 1,129 896 1,359
Capital Expenditures                 186 429 437
Assets 8,887       11,674       8,887 11,674  
Inter-segment Elimination
                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 (527) (493) (465)
Total Other Income, net                 (723) (726) (729)
Interest Charges                 (97) (96) (97)
Assets $ (7,927)       $ (10,113)       $ (7,927) $ (10,113)