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Long-Term Debt and Short-Term Borrowings, Interest Rate Swap Agreement (Details) - Interest Rate Swap [Member] - Variable Rate Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series 2008A, due 2029 [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Interest Rate Swap Agreement [Abstract] |  |
Notional amount of swap | $ 12,000 |
Potential payment to counterparty | $ 2,830 |
Fixed interest rate | 3.16% |
Net payment rate on swap | 2.87% | 1.84%
Interest rate spread | 0.03% | 0.75%
Overall effective rate, including variable interest and swap payments | 3.19% | 3.91%
LIBOR [Member] |  |
Interest Rate Swap Agreement [Abstract] |  |
Percentage of variable interest rate | 59.00% |
Term of variable rate | 1 month |

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- Definition Term of the interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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