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Note 10 - Short-term and Long-term Borrowings (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Line of Credit Facilities [Table Text Block] |
(in thousands) |  | Line Limit |  |  | In Use on September 30, 2020 |  |  | Restricted due to Outstanding Letters of Credit |  |  | Available on September 30, 2020 |  |  | Available on December 31, 2019 |
Otter Tail Corporation Credit Agreement |  | $ | 170,000 |  |  | $ | 48,600 |  |  | $ | - |  |  | $ | 121,400 |  |  | $ | 164,000 |
OTP Credit Agreement |  |  | 170,000 |  |  |  | - |  |  |  | 7,670 |  |  |  | 162,330 |  |  |  | 154,524 |
Total |  | $ | 340,000 |  |  | $ | 48,600 |  |  | $ | 7,670 |  |  | $ | 283,730 |  |  | $ | 318,524 |
Schedule of Debt [Table Text Block] |
September 30, 2020 (in thousands) |  | OTP |  |  | Otter Tail Corporation |  |  | Consolidated |
Short-Term Debt |  | $ | - |  |  | $ | 48,600 |  |  | $ | 48,600 |
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 3.22%, Series 2020A, due February 25, 2030 |  |  | 10,000 |  |  |  |  |  |  |  | 10,000 |
Senior Unsecured Notes 3.22%, Series 2020B, due August 20, 20301 |  |  | 40,000 |  |  |  |  |  |  |  | 40,000 |
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 3.62%. Series 2020C, due February 25, 2040 |  |  | 10,000 |  |  |  |  |  |  |  | 10,000 |
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 |
Senior Unsecured Notes 3.92%, Series 2020D, due February 25, 2050 |  |  | 15,000 |  |  |  |  |  |  |  | 15,000 |
PACE Note, 2.54%, due March 18, 2021 |  |  |  |  |  |  | 215 |  |  |  | 215 |
Total |  | $ | 687,000 |  |  | $ | 80,215 |  |  | $ | 767,215 |
Less: Current Maturities net of Unamortized Debt Issuance Costs |  |  | - |  |  |  | 215 |  |  |  | 215 |
Unamortized Long-Term Debt Issuance Costs |  |  | 2,408 |  |  |  | 318 |  |  |  | 2,726 |
Total Long-Term Debt net of Unamortized Debt Issuance Costs |  | $ | 684,592 |  |  | $ | 79,682 |  |  | $ | 764,274 |
Total Short-Term and Long-Term Debt (with current maturities) |  | $ | 684,592 |  |  | $ | 128,497 |  |  | $ | 813,089 |
December 31, 2019 (in thousands) |
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 |

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