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Note 10 - Short-term and Long-term Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Line of Credit Facilities [Table Text Block] |
(in thousands) |  | Line Limit |  |  | In Use on December 31, 2019 |  |  | Restricted due to Outstanding Letters of Credit |  |  | Available on December 31, 2019 |  |  | Available on December 31, 2018 |
Otter Tail Corporation Credit Agreement |  | $ | 170,000 |  |  | $ | 6,000 |  |  | $ | - |  |  | $ | 164,000 |  |  | $ | 120,785 |
OTP Credit Agreement |  |  | 170,000 |  |  |  | - |  |  |  | 15,476 |  |  |  | 154,524 |  |  |  | 160,316 |
Total |  | $ | 340,000 |  |  | $ | 6,000 |  |  | $ | 15,476 |  |  | $ | 318,524 |  |  | $ | 281,101 |
Schedule of Debt [Table Text Block] |
December 31, 2019 (in thousands) |  | OTP |  |  | Otter Tail Corporation |  |  | Otter Tail Corporation Consolidated |
Short-Term Debt |  | $ | - |  |  | $ | 6,000 |  |  | $ | 6,000 |
Long-Term Debt: |  |  |  |  |  |  |  |  |  |  |  |
3.55% Guaranteed Senior Notes, due December 15, 2026 |  |  |  |  |  | $ | 80,000 |  |  | $ | 80,000 |
Senior Unsecured Notes 4.63%, Series 2011A, due December 1, 2021 |  | $ | 140,000 |  |  |  |  |  |  |  | 140,000 |
Senior Unsecured Notes 6.15%, Series 2007B, due August 20, 2022 |  |  | 30,000 |  |  |  |  |  |  |  | 30,000 |
Senior Unsecured Notes 6.37%, Series 2007C, due August 20, 2027 |  |  | 42,000 |  |  |  |  |  |  |  | 42,000 |
Senior Unsecured Notes 4.68%, Series 2013A, due February 27, 2029 |  |  | 60,000 |  |  |  |  |  |  |  | 60,000 |
Senior Unsecured Notes 3.07%, Series 2019A, due October 10, 20291 |  |  | 10,000 |  |  |  |  |  |  |  | 10,000 |
Senior Unsecured Notes 6.47%, Series 2007D, due August 20, 2037 |  |  | 50,000 |  |  |  |  |  |  |  | 50,000 |
Senior Unsecured Notes 3.52%, Series 2019B, due October 10, 2039 |  |  | 26,000 |  |  |  |  |  |  |  | 26,000 |
Senior Unsecured Notes 5.47%, Series 2013B, due February 27, 2044 |  |  | 90,000 |  |  |  |  |  |  |  | 90,000 |
Senior Unsecured Notes 4.07%, Series 2018A, due February 7, 2048 |  |  | 100,000 |  |  |  |  |  |  |  | 100,000 |
Senior Unsecured Notes 3.82%, Series 2019C, due October 10, 2049 |  |  | 64,000 |  |  |  |  |  |  |  | 64,000 |
PACE Note, 2.54%, due March 18, 2021 |  |  |  |  |  |  | 351 |  |  |  | 351 |
Total |  | $ | 612,000 |  |  | $ | 80,351 |  |  | $ | 692,351 |
Less: Current Maturities net of Unamortized Debt Issuance Costs |  |  | - |  |  |  | 183 |  |  |  | 183 |
Unamortized Long-Term Debt Issuance Costs |  |  | 2,231 |  |  |  | 356 |  |  |  | 2,587 |
Total Long-Term Debt net of Unamortized Debt Issuance Costs |  | $ | 609,769 |  |  | $ | 79,812 |  |  | $ | 689,581 |
Total Short-Term and Long-Term Debt (with current maturities) |  | $ | 609,769 |  |  | $ | 85,995 |  |  | $ | 695,764 |
December 31, 2018 (in thousands) |  | OTP |  |  | Otter Tail Corporation |  |  | Otter Tail Corporation Consolidated |
Short-Term Debt |  | $ | 9,384 |  |  | $ | 9,215 |  |  | $ | 18,599 |
Long-Term Debt: |  |  |  |  |  |  |  |  |  |  |  |
3.55% Guaranteed Senior Notes, due December 15, 2026 |  |  |  |  |  | $ | 80,000 |  |  | $ | 80,000 |
Senior Unsecured Notes 4.63%, Series 2011A, due December 1, 2021 |  | $ | 140,000 |  |  |  |  |  |  |  | 140,000 |
Senior Unsecured Notes 6.15%, Series 2007B, due August 20, 2022 |  |  | 30,000 |  |  |  |  |  |  |  | 30,000 |
Senior Unsecured Notes 6.37%, Series 2007C, due August 20, 2027 |  |  | 42,000 |  |  |  |  |  |  |  | 42,000 |
Senior Unsecured Notes 4.68%, Series 2013A, due February 27, 2029 |  |  | 60,000 |  |  |  |  |  |  |  | 60,000 |
Senior Unsecured Notes 6.47%, Series 2007D, due August 20, 2037 |  |  | 50,000 |  |  |  |  |  |  |  | 50,000 |
Senior Unsecured Notes 5.47%, Series 2013B, due February 27, 2044 |  |  | 90,000 |  |  |  |  |  |  |  | 90,000 |
Senior Unsecured Notes 4.07%, Series 2018A, due February 7, 2048 |  |  | 100,000 |  |  |  |  |  |  |  | 100,000 |
PACE Note, 2.54%, due March 18, 2021 |  |  |  |  |  |  | 523 |  |  |  | 523 |
Total |  | $ | 512,000 |  |  | $ | 80,523 |  |  | $ | 592,523 |
Less: Current Maturities net of Unamortized Debt Issuance Costs |  |  | - |  |  |  | 172 |  |  |  | 172 |
Unamortized Long-Term Debt Issuance Costs |  |  | 1,942 |  |  |  | 407 |  |  |  | 2,349 |
Total Long-Term Debt net of Unamortized Debt Issuance Costs |  | $ | 510,058 |  |  | $ | 79,944 |  |  | $ | 590,002 |
Total Short-Term and Long-Term Debt (with current maturities) |  | $ | 519,442 |  |  | $ | 89,331 |  |  | $ | 608,773 |
Schedule of Maturities of Long-term Debt [Table Text Block] |
(in thousands) |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |
Aggregate Amounts of Debt Maturities |  | $ | 183 |  |  | $ | 140,168 |  |  | $ | 30,000 |  |  | $ | - |  |  | $ | - |

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