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Note 11 - Pension Plan and Other Postretirement Benefits - Reconciliation of Changes in Fair Value of Plan Assets and Plan's Benefit Obligations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Plan [Member] |  |  |  |
Reconciliation of Fair Value of Plan Assets: |  |  |  |
Fair Value of Plan Assets, beginning balance |  | $ 269,783 | $ 285,319 |
Actual Return on Plan Assets |  | 52,640 | (21,334) |
Discretionary Company Contributions |  | 22,500 | 20,000 |
Benefit Payments |  | (15,142) | (14,202) |
Fair Value of Plan Assets, ending balance |  | $ 329,781 | $ 269,783 | $ 285,319
Estimated Asset Return |  | 19.30% | (7.30%) |
Reconciliation of Projected Benefit Obligation: |  |  |  |
Projected Benefit Obligation, beginning balance |  | $ 328,442 | $ 352,718 |
Service Cost |  | 5,491 | 6,459 | 5,629
Interest Cost |  | 14,412 | 13,452 | 14,139
Benefit Payments |  | (15,142) | (14,202) |
Actuarial Loss (Gain) |  | 51,582 | (29,985) |
Projected Benefit Obligation, ending balance |  | 384,785 | 328,442 | 352,718
Reconciliation of Accrued Postretirement Cost: |  |  |  |
Expense | [1] | (3,376) | (6,046) | (5,877)
Discretionary Company Contributions |  | 22,500 | 20,000 |
Executive Survivor and Supplemental Retirement Plan [Member] |  |  |  |
Reconciliation of Fair Value of Plan Assets: |  |  |  |
Fair Value of Plan Assets, beginning balance |  | 0 | 0 |
Actual Return on Plan Assets |  | 0 | 0 |
Discretionary Company Contributions |  | 1,475 | 1,505 |
Benefit Payments |  | (1,475) | (1,505) |
Fair Value of Plan Assets, ending balance |  | 0 | 0 | 0
Reconciliation of Projected Benefit Obligation: |  |  |  |
Projected Benefit Obligation, beginning balance |  | 39,699 | 42,308 |
Service Cost |  | 418 | 408 | 290
Interest Cost |  | 1,735 | 1,589 | 1,686
Benefit Payments |  | (1,475) | (1,505) |
Actuarial Loss (Gain) |  | 5,260 | (3,101) |
Projected Benefit Obligation, ending balance |  | 43,966 | 39,699 | 42,308
Curtailments |  | (1,671) | 0 |
Reconciliation of Accrued Postretirement Cost: |  |  |  |
Expense | [2] | (2,647) | (2,979) | (2,755)
Discretionary Company Contributions |  | 1,475 | 1,505 |
Other Postretirement Benefits Plan [Member] |  |  |  |
Reconciliation of Fair Value of Plan Assets: |  |  |  |
Fair Value of Plan Assets, beginning balance |  | 0 | 0 |
Actual Return on Plan Assets |  | 0 | 0 |
Discretionary Company Contributions |  | 2,757 | 3,183 |
Benefit Payments |  | (7,164) | (6,684) |
Fair Value of Plan Assets, ending balance |  | 0 | 0 | 0
Participant Premium Payments |  | 4,407 | 3,501 |
Reconciliation of Projected Benefit Obligation: |  |  |  |
Projected Benefit Obligation, beginning balance |  | 71,561 | 69,774 |
Service Cost |  | 1,286 | 1,526 | 1,425
Interest Cost |  | 3,083 | 2,583 | 2,712
Benefit Payments |  | (7,164) | (6,684) |
Actuarial Loss (Gain) |  | 19,128 | 861 |
Projected Benefit Obligation, ending balance |  | 71,437 | 71,561 | 69,774
Participant Premium Payments |  | 4,407 | 3,501 |
Plan Amendments |  | (20,864) | 0 |
Reconciliation of Accrued Postretirement Cost: |  |  |  |
Accrued Postretirement Cost at January 1 |  | (53,574) | (50,958) |
Expense | [3] | (5,978) | (5,799) | (5,092)
Discretionary Company Contributions |  | 2,757 | 3,183 |
Accrued Postretirement Cost at December 31 |  | $ (56,795) | $ (53,574) | $ (50,958)
[1] | Allocation of Costs: 2019 2018 2017 Service costs included in OTP Capital Expenditures $ 1,365 $ 1,542 $ 1,094 Service costs included in electric operation and maintenance expenses 3,994 4,756 4,400 Service costs included in other nonelectric expenses 132 161 135 Nonservice costs capitalized (526 ) (99 ) 48 Nonservice costs included in nonservice cost components of postretirement benefits (1,589 ) (314 ) 200
[2] | Allocation of Costs: 2019 2018 2017 Service costs included in electric operation and maintenance expenses $ 104 $ 99 $ 94 Service costs included in other nonelectric expenses 314 309 196 Nonservice costs included in nonservice cost components of postretirement benefits 2,229 2,571 2,465
[3] | Allocation of Cost: 2019 2018 2017 Service Costs included in OTP capital expenditures $ 320 $ 364 $ 277 Service costs included in electric operation and maintenance expenses 935 1,124 1,114 Service costs included in other nonelectric expenses 31 38 34 Nonservice costs capitalized 1,167 1,020 712 Nonservice costs included in nonservice cost components of postretirement benefits 3,525 3,253 2,955

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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