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Business Segment Data (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]      
Number of Reportable Segments 2 2  
Operating Revenues $ 31,769 $ 30,698  
Operating Income 6,527 7,028  
Net Income 7,668 6,552  
Capital Expenditures 25,147 12,324  
Assets 935,316   $ 909,878
Regulated [Member]      
Segment Reporting Information [Line Items]      
Operating Revenues 28,937 27,898  
Operating Income 5,843 6,034  
Net Income 7,181 5,868  
Capital Expenditures 24,968 12,293  
Assets 924,476   910,081
Non - Regulated [Member]      
Segment Reporting Information [Line Items]      
Operating Revenues 2,961 2,925  
Operating Income 684 994  
Net Income 487 684  
Capital Expenditures 179 31  
Assets 9,378   9,686
Inter-segment Elimination [Member]      
Segment Reporting Information [Line Items]      
Operating Revenues (129) $ (125)  
Assets $ 1,462   $ (9,889)