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Business Segment Data (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Revenues $ 47,732 $ 39,874 $ 123,611 $ 109,117  
Operating Income 16,575 11,424 39,186 26,873  
Net Income 14,291 11,476 35,258 29,305  
Capital Expenditures 26,596 14,745 65,939 61,245  
Assets 1,064,669   1,064,669   $ 1,020,015
Inter-segment Elimination [Member]          
Segment Reporting Information [Line Items]          
Revenues (560) (517) (927) (966)  
Assets 9,049   9,049   (9,912)
Regulated [Member]          
Segment Reporting Information [Line Items]          
Revenues 44,861 37,396 115,222 100,426  
Operating Income 15,750 10,654 36,793 24,082  
Net Income 13,683 10,924 33,496 27,271  
Capital Expenditures 26,588 14,743 65,722 61,097  
Assets 1,066,755   1,066,755   1,022,116
Non - Regulated [Member]          
Segment Reporting Information [Line Items]          
Revenues 3,431 2,995 9,316 9,657  
Operating Income 825 770 2,393 2,791  
Net Income 608 552 1,762 2,034  
Capital Expenditures 8 $ 2 217 $ 148  
Assets $ 6,963   $ 6,963   $ 7,811