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Business Segment Data (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]          
Number of Reportable Segments     2    
Operating Revenues $ 35,277 $ 33,393 $ 67,046 $ 64,090  
Operating Income 9,385 8,950 15,912 15,977  
Net Income 9,713 8,146 17,381 14,696  
Capital Expenditures 20,270 23,374 45,417 35,698  
Assets 950,870   950,870   $ 909,878
Regulated [Member]          
Segment Reporting Information [Line Items]          
Operating Revenues 32,289 30,444 61,226 58,342  
Operating Income 8,639 7,903 14,480 13,936  
Net Income 9,192 7,423 16,371 13,290  
Capital Expenditures 19,913 23,268 44,882 35,561  
Assets 953,703   953,703   910,081
Non - Regulated [Member]          
Segment Reporting Information [Line Items]          
Operating Revenues 3,180 3,087 6,141 6,012  
Operating Income 746 1,047 1,432 2,041  
Net Income 521 723 1,010 1,406  
Capital Expenditures 357 106 535 137  
Assets 10,150   10,150   9,686
Inter-segment Elimination [Member]          
Segment Reporting Information [Line Items]          
Operating Revenues (192) $ (138) (321) $ (264)  
Assets $ (12,983)   $ (12,983)   $ (9,889)