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Business Segment Data (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]                      
Number of Reportable Segments                 2    
Revenues $ 33,268 $ 38,713 $ 34,919 $ 31,177 $ 31,456 $ 36,174 $ 33,014 $ 30,131 $ 138,077 $ 130,775 $ 132,906
Operating Income 7,153 12,918 10,721 6,350 8,264 12,601 9,358 7,575 37,142 37,798 40,302
Depreciation                 15,037 13,922 12,796
Other Income (Expense), Net                 2,992 1,617 (532)
Interest Expense                 6,758 5,506 5,293
Income Taxes                 924 11,100 11,735
Net Income 6,993 $ 12,290 $ 8,675 $ 4,494 5,345 $ 7,642 $ 5,381 $ 4,441 32,452 22,809 22,742
Capital Expenditures                 72,094 50,301 47,375
Assets 767,830       661,140       767,830 661,140  
Inter-segment Elimination [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 (602) (591) (499)
Other Income (Expense), Net                 (411) (467) (333)
Interest Expense                 (411) (467) (89)
Assets (5,913)       (7,769)       (5,913) (7,769)  
Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 121,901 115,454 118,017
Operating Income                 34,127 35,130 37,871
Depreciation                 14,846 13,732 12,606
Other Income (Expense), Net                 3,284 2,020 1,109
Interest Expense                 7,060 5,855 5,293
Income Taxes                 (54) 9,848 11,091
Net Income                 30,405 21,447 22,353
Capital Expenditures                 71,493 50,078 47,189
Assets 764,749       661,816       764,749 661,816  
Non - Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 16,778 15,912 15,388
Operating Income                 3,015 2,668 2,431
Depreciation                 191 190 190
Other Income (Expense), Net                 119 64 (1,308)
Interest Expense                 109 118 89
Income Taxes                 978 1,252 644
Net Income                 2,047 1,362 389
Capital Expenditures                 601 223 $ 186
Assets $ 8,994       $ 7,093       $ 8,994 $ 7,093