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DEBT, Long-Term Debt (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 144,090 | $ 145,862
Less: current maturities (principal amount) | 1,757 | 1,706
Total long-term debt | 142,333 | 144,156
Payments of principal amounts due during the next five years and thereafter [Abstract] |  |
2020 | 1,757 |
2021 | 1,544 |
2022 | 1,585 |
2023 | 1,520 |
2024 | 1,484 |
Thereafter | 136,200 |
Promissory Note [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 11,279 | 11,648
Interest rate, stated percentage | 5.12% |
Maturity date | Dec. 30, 2028 |
First Mortgage Bonds [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 127,800 | 128,400
Payments of principal amounts due during the next five years and thereafter [Abstract] |  |
2020 | 600 |
2021 | 600 |
2022 | 600 |
2023 | 600 |
2024 | 600 |
Thereafter | 124,800 |
First Mortgage Bonds [Member] | Series R [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 25,000 | 25,000
Interest rate, stated percentage | 5.96% |
Maturity date | Dec. 31, 2028 |
First Mortgage Bonds [Member] | Series S [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 7,800 | 8,400
Interest rate, stated percentage | 4.45% |
Maturity date | Dec. 31, 2033 |
First Mortgage Bonds [Member] | Series T [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 40,000 | 40,000
Interest rate, stated percentage | 4.24% |
Maturity date | Dec. 20, 2036 |
First Mortgage Bonds [Member] | Series U [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 25,000 | 25,000
Interest rate, stated percentage | 4.71% |
Maturity date | Jan. 31, 2038 |
First Mortgage Bonds [Member] | Series V [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 30,000 | 30,000
Interest rate, stated percentage | 4.42% |
Maturity date | Oct. 31, 2049 |
State Revolving Fund Loans [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 5,011 | 5,814
Payments of principal amounts due during the next five years and thereafter [Abstract] |  |
2020 | 767 |
2021 | 533 |
2022 | 552 |
2023 | 466 |
2024 | 404 |
Thereafter | 2,289 |
State Revolving Fund Loans [Member] | 4.48%, due 08/01/2021 [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 318 | 622
Interest rate, stated percentage | 4.48% |
Maturity date | Aug. 01, 2021 |
State Revolving Fund Loans [Member] | 3.57%, due 09/01/2023 [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 294 | 385
Interest rate, stated percentage | 3.57% |
Maturity date | Sep. 01, 2023 |
State Revolving Fund Loans [Member] | 3.64%, due 05/01/2025 [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 648 | 778
Interest rate, stated percentage | 3.64% |
Maturity date | May 01, 2025 |
State Revolving Fund Loans [Member] | 3.41%, due 02/01/2031 [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 1,887 | 2,034
Interest rate, stated percentage | 3.41% |
Maturity date | Feb. 01, 2031 |
State Revolving Fund Loans [Member] | 3.40%, due 07/01/2032 [Member] |  |
Long-term debt consists of [Abstract] |  |
Promissory Note, 5.12%, due December 30, 2028 | $ 1,864 | $ 1,995
Interest rate, stated percentage | 3.40% |
Maturity date | Jul. 01, 2032 |
State Revolving Fund Loans [Member] | Promissory Note [Member] |  |
Payments of principal amounts due during the next five years and thereafter [Abstract] |  |
2020 | $ 390 |
2021 | 411 |
2022 | 433 |
2023 | 454 |
2024 | 480 |
Thereafter | $ 9,111 |

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