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Business Segment Data (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]                      
Number of Reportable Segments                 2    
Revenues $ 34,025 $ 39,874 $ 36,701 $ 32,541 $ 34,626 $ 39,920 $ 35,277 $ 31,769 $ 143,141 $ 141,592 $ 134,598
Operating Income 6,339 11,424 9,814 5,634 8,331 13,177 9,385 6,527 33,211 37,420 35,520
Depreciation                 21,109 18,472 16,716
Other Income (Expense), Net                 5,958 4,379 2,492
Interest Expense                 8,114 7,493 7,264
Income Taxes                 (5,488) (4,119) (3,140)
Net Income 7,237 $ 11,476 $ 10,923 $ 6,907 8,307 $ 12,737 $ 9,713 $ 7,668 36,543 38,425 33,888
Capital Expenditures                 79,378 105,619 89,125
Assets 1,020,015       976,470       1,020,015 976,470  
Non - Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 12,818 12,545 12,177
Operating Income                 3,634 3,377 3,715
Depreciation                 212 208 235
Other Income (Expense), Net                 279 130 (253)
Interest Expense                 17 70 81
Income Taxes                 1,235 1,020 1,177
Net Income                 2,694 2,474 2,286
Capital Expenditures                 183 528 267
Assets 7,811       8,289       7,811 8,289  
Regulated [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 131,531 129,851 123,078
Operating Income                 29,577 34,043 31,805
Depreciation                 20,897 18,264 16,481
Other Income (Expense), Net                 6,112 4,605 3,018
Interest Expense                 8,529 7,780 7,456
Income Taxes                 (6,723) (5,139) (4,317)
Net Income                 33,849 35,951 31,602
Capital Expenditures                 79,195 105,091 88,858
Assets 1,022,116       998,932       1,022,116 998,932  
Inter-segment Elimination [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 (1,208) (804) (657)
Other Income (Expense), Net                 (433) (356) (273)
Interest Expense                 (432) (357) $ (273)
Assets $ (9,912)       $ (30,751)       $ (9,912) $ (30,751)