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Business Segment Data (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
N
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Segment Reporting Information [Line Items]                      
Number of Reportable Segments | N                 2    
Revenues $ 30,925 $ 34,654 $ 31,666 $ 28,780 $ 28,107 $ 32,669 $ 29,190 $ 27,173 $ 126,025 $ 117,139 $ 114,846
Operating Income 8,460 11,460 9,235 6,685 8,058 11,620 8,747 5,967 35,840 34,392 30,970
Depreciation                 12,051 11,444 10,988
Other Income (Expense), Net                 293 (403) 91
Interest Expense                 5,554 5,607 5,807
Income Taxes                 10,551 9,937 8,621
Net Income 4,560 $ 6,743 $ 5,089 $ 3,636 3,790 $ 6,758 $ 4,728 $ 3,169 20,028 18,445 16,633
Capital Expenditures                 25,773 22,596 20,080
Assets 584,722       575,772       584,722 575,772  
Inter-segment Elimination [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 (460) (560) (527)
Other Income (Expense), Net                 (346) (485) (723)
Interest Expense                 (89) (91) (97)
Assets (6,374)       (6,334)       (6,374) (6,334)  
Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 111,247 103,556 100,910
Operating Income                 33,603 32,000 28,744
Depreciation                 11,874 11,262 10,807
Other Income (Expense), Net                 619 157 828
Interest Expense                 5,554 5,607 5,807
Income Taxes                 9,522 8,907 7,635
Net Income                 18,889 17,249 15,504
Capital Expenditures                 25,706 22,498 19,894
Assets 584,660       574,854       584,660 574,854  
Non - Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 15,238 14,143 14,463
Operating Income                 2,237 2,392 2,226
Depreciation                 177 182 181
Other Income (Expense), Net                 20 (75) (14)
Interest Expense                 89 91 97
Income Taxes                 1,029 1,030 986
Net Income                 1,139 1,196 1,129
Capital Expenditures                 67 98 $ 186
Assets $ 6,436       $ 7,252       $ 6,436 $ 7,252