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Business Segment Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
N
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Number of Reportable Segments                 2    
Operating Revenues $ 27,079 $ 32,353 $ 27,401 $ 23,546 $ 23,300 $ 28,671 $ 26,102 $ 23,996 $ 110,379 $ 102,069 $ 102,735
Operating Income 5,717 10,843 7,210 3,877 4,179 8,516 6,738 4,768 27,647 24,201 26,597
Depreciation                 10,409 9,746 9,244
Total Other Income, net                 857 2,149 1,444
Interest Charges                 6,725 6,376 6,925
Income Taxes                 7,383 6,527 6,786
Net Income 2,726 6,138 3,725 1,807 2,049 5,143 3,625 2,630 14,396 13,447 14,330
Capital Expenditures                 21,578 23,562 29,604
Assets 561,726       537,536       561,726 537,536  
Regulated
                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 98,021 91,729 92,378
Operating Income                 25,944 22,760 24,815
Depreciation                 10,241 9,601 9,093
Total Other Income, net                 1,489 1,982 1,265
Interest Charges                 6,725 6,376 6,925
Income Taxes                 6,579 5,548 6,004
Net Income                 13,500 12,088 13,152
Capital Expenditures                 21,149 23,125 29,344
Assets 560,165       539,947       560,165 539,947  
Non - Regulated
                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 12,851 10,805 10,937
Operating Income                 1,703 1,441 1,782
Depreciation                 168 145 151
Total Other Income, net                 94 896 313
Interest Charges                 96 97 134
Income Taxes                 804 979 782
Net Income                 896 1,359 1,178
Capital Expenditures                 429 437 260
Assets 11,674       10,325       11,674 10,325  
Inter-segment Elimination
                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 (493) (465) (580)
Total Other Income, net                 (726) (729) (134)
Interest Charges                 (96) (97) (134)
Assets $ (10,113)       $ (12,736)       $ (10,113) $ (12,736)