Long-Term Debt and Short-Term Borrowings, Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Long-term Debt [Abstract]
Total long-term debt	$ 149,190	$ 126,570
Less discount on issuance of long-term debt	(169)	(181)
Less unamortized debt issuance costs	(2,652)	(2,816)
Less current maturities	(7,500)	0
Long-term portion	138,869	123,573
8.43% Senior Notes, Series D, due 2022 [Member]
Long-term Debt [Abstract]
Total long-term debt	$ 7,500	7,500
Interest rate	8.43%
Variable Rate Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series 2008A, due 2029 [Member]
Long-term Debt [Abstract]
Total long-term debt	$ 12,000	12,000
3.00% Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series A of 2019, due 2036 [Member]
Long-term Debt [Abstract]
Total long-term debt	$ 10,500	10,500
Interest rate	3.00%
3.10% Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series B of 2019, due 2038 [Member]
Long-term Debt [Abstract]
Total long-term debt	$ 14,870	14,870
Interest rate	3.10%
3.23% Senior Notes, due 2040 [Member]
Long-term Debt [Abstract]
Total long-term debt	$ 15,000	15,000
Interest rate	3.23%
4.00% - 4.50% York County Industrial Development Authority Exempt Facilities Revenue Bonds, Series 2015, due 2029 - 2045 [Member]
Long-term Debt [Abstract]
Total long-term debt	$ 10,000	10,000
4.00% - 4.50% York County Industrial Development Authority Exempt Facilities Revenue Bonds, Series 2015, due 2029 - 2045 [Member] \| Minimum [Member]
Long-term Debt [Abstract]
Interest rate	4.00%
4.00% - 4.50% York County Industrial Development Authority Exempt Facilities Revenue Bonds, Series 2015, due 2029 - 2045 [Member] \| Maximum [Member]
Long-term Debt [Abstract]
Interest rate	4.50%
4.54% Senior Notes, due 2049 [Member]
Long-term Debt [Abstract]
Total long-term debt	$ 20,000	20,000
Interest rate	4.54%
3.24% Senior Notes, due 2050 [Member]
Long-term Debt [Abstract]
Total long-term debt	$ 30,000	$ 30,000
Interest rate	3.24%	3.24%
Committed Line of Credit, due 2023 [Member]
Long-term Debt [Abstract]
Total long-term debt	$ 29,320	$ 6,700

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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