Quarterly Data - Unaudited (Details) - Schedule of financial information for each quarter - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Quarterly Data - Unaudited (Details) - Schedule of financial information for each quarter [Line Items]
Operating Revenues (in Dollars)	$ 38,823	$ 47,732	$ 39,683	$ 36,196	$ 34,025	$ 39,874	$ 36,701	$ 32,541	$ 162,434	$ 143,141
Gain on Sale of Subsidiary (in Dollars)				5,232					5,232
Operating Income (in Dollars)	8,146	16,575	10,088	12,523	6,339	11,424	9,814	5,634	47,332	33,211
Net Income (in Dollars)	$ 7,169	$ 14,291	$ 8,868	$ 12,100	$ 7,237	$ 11,476	$ 10,923	$ 6,907	$ 42,428	$ 36,543
Basic Earnings per Share	$ 0.4	$ 0.81	$ 0.5	$ 0.69	$ 0.42	$ 0.65	$ 0.62	$ 0.39	$ 2.4	$ 2.08
Diluted Earnings per Share	0.4	0.81	0.5	0.68	0.41	0.65	0.62	0.39	2.39	2.07
Common Dividend Per Share	0.3125	0.29	0.29	0.29	0.29	0.2725	0.2725	0.2725	$ 1.1825	$ 1.1075
Minimum [Member]
Quarterly Data - Unaudited (Details) - Schedule of financial information for each quarter [Line Items]
High/Low Common Stock Price	74.2	77.08	75.77	94.56	119.37	116.4	88.61	85.92
Maximum [Member]
Quarterly Data - Unaudited (Details) - Schedule of financial information for each quarter [Line Items]
High/Low Common Stock Price	$ 95.82	$ 96.19	$ 108.27	$ 121.1	$ 98.12	$ 81.02	$ 77.31	$ 67.09