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Note 9 - Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Contractual Obligation, Fiscal Year Maturity [Table Text Block] |
(in thousands) |  | Construction Program and Other Commitments |  |  | Capacity and Energy Requirements |  |  | Coal Purchase Commitments |  |  | OTP Land Easement Payments |
2020 |  | $ | 269,774 |  |  | $ | 24,844 |  |  | $ | 22,644 |  |  | $ | 630 |
2021 |  |  | 47,230 |  |  |  | 12,988 |  |  |  | 22,935 |  |  |  | 642 |
2022 |  |  | 22 |  |  |  | 11,827 |  |  |  | 22,793 |  |  |  | 655 |
2023 |  |  | 11 |  |  |  | 11,827 |  |  |  | 23,955 |  |  |  | 668 |
2024 |  |  | 6 |  |  |  | 11,801 |  |  |  | 24,369 |  |  |  | 682 |
Beyond 2024 |  |  | - |  |  |  | 131,913 |  |  |  | 479,123 |  |  |  | 6,931 |
Total |  | $ | 317,043 |  |  | $ | 205,200 |  |  | $ | 595,819 |  |  | $ | 10,208 |

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- Definition Tabular disclosure of contractual obligation by timing of payment due. Includes, but is not limited to, long-term debt obligation, lease obligation, and purchase obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph (a) -Subparagraph (5) + Details
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