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DEBT, Long-Term Debt (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Long-term debt consists of [Abstract] |  |
Long term debt | $ 144,850 | $ 144,090
Less: current maturities (principal amount) | 1,591 | 1,757
Total long-term debt | 143,259 | 142,333
Payments of principal amounts due during the next five years and thereafter [Abstract] |  |
2020 | 1,591 |
2021 | 1,701 |
2022 | 1,638 |
2023 | 1,603 |
2024 | 1,563 |
Thereafter | 136,754 |
Promissory Note [Member] |  |
Long-term debt consists of [Abstract] |  |
Long term debt | $ 10,888 | 11,279
Interest rate, stated percentage | 5.12% |
Maturity date | Dec. 30, 2028 |
First Mortgage Bonds [Member] |  |
Long-term debt consists of [Abstract] |  |
Long term debt | $ 127,200 | 127,800
Payments of principal amounts due during the next five years and thereafter [Abstract] |  |
2020 | 600 |
2021 | 600 |
2022 | 600 |
2023 | 600 |
2024 | 600 |
Thereafter | 124,200 |
First Mortgage Bonds [Member] | Series R [Member] |  |
Long-term debt consists of [Abstract] |  |
Long term debt | $ 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] |  |
Long term debt | $ 7,200 | 7,800
Interest rate, stated percentage | 4.45% |
Maturity date | Dec. 31, 2033 |
First Mortgage Bonds [Member] | Series T [Member] |  |
Long-term debt consists of [Abstract] |  |
Long term debt | $ 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] |  |
Long term debt | $ 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] |  |
Long term debt | $ 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] |  |
Long term debt | $ 6,762 | 5,011
Payments of principal amounts due during the next five years and thereafter [Abstract] |  |
2020 | 580 |
2021 | 668 |
2022 | 584 |
2023 | 523 |
2024 | 458 |
Thereafter | 3,949 |
State Revolving Fund Loans [Member] | 4.48%, due 08/01/2021 [Member] |  |
Long-term debt consists of [Abstract] |  |
Long term debt | $ 0 | 318
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] |  |
Long term debt | $ 200 | 294
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] |  |
Long term debt | $ 513 | 648
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] |  |
Long term debt | $ 1,735 | 1,887
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] |  |
Long term debt | $ 1,729 | 1,864
Interest rate, stated percentage | 3.40% |
Maturity date | Jul. 01, 2032 |
State Revolving Fund Loans [Member] | 1.187% due 11/01/2041 [Member] |  |
Long-term debt consists of [Abstract] |  |
Long term debt | $ 2,585 | $ 0
Interest rate, stated percentage | 1.187% |
Maturity date | Nov. 01, 2041 |
State Revolving Fund Loans [Member] | Promissory Note [Member] |  |
Payments of principal amounts due during the next five years and thereafter [Abstract] |  |
2020 | $ 411 |
2021 | 433 |
2022 | 454 |
2023 | 480 |
2024 | 505 |
Thereafter | $ 8,605 |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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