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Note 11 - Pension Plan and Other Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Net Benefit Costs [Table Text Block] |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Service Cost–Benefit Earned During the Period |  | $ | 5,491 |  |  | $ | 6,459 |  |  | $ | 5,629 |
Interest Cost on Projected Benefit Obligation |  |  | 14,412 |  |  |  | 13,452 |  |  |  | 14,139 |
Expected Return on Assets |  |  | (21,297 | ) |  |  | (21,199 | ) |  |  | (19,229 | )
Amortization of Prior Service Cost: |  |  |  |  |  |  |  |  |  |  |  |
From Regulatory Asset |  |  | 5 |  |  |  | 16 |  |  |  | 120 |
From Other Comprehensive Income1 |  |  | 9 |  |  |  | - |  |  |  | 3 |
Amortization of Net Actuarial Loss: |  |  |  |  |  |  |  |  |  |  |  |
From Regulatory Asset |  |  | 4,642 |  |  |  | 7,135 |  |  |  | 5,090 |
From Other Comprehensive Income1 |  |  | 114 |  |  |  | 183 |  |  |  | 125 |
Net Periodic Pension Cost2 |  | $ | 3,376 |  |  | $ | 6,046 |  |  | $ | 5,877 |
2Allocation of costs: |  | 2019 |  |  | 2018 |  |  | 2017 |
Service c osts 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 n onservice cost components of postretirement benefits |  |  | (1,589 | ) |  |  | (314 | ) |  |  | 200 |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Service Cost–Benefit Earned During the Period |  | $ | 418 |  |  | $ | 408 |  |  | $ | 290 |
Interest Cost on Projected Benefit Obligation |  |  | 1,735 |  |  |  | 1,589 |  |  |  | 1,686 |
Amortization of Prior Service Cost: |  |  |  |  |  |  |  |  |  |  |  |
From Regulatory Asset |  |  | 5 |  |  |  | 20 |  |  |  | 16 |
From Other Comprehensive Income1 |  |  | 17 |  |  |  | 34 |  |  |  | 38 |
Amortization of Net Actuarial Loss: |  |  |  |  |  |  |  |  |  |  |  |
From Regulatory Asset |  |  | 124 |  |  |  | 206 |  |  |  | 285 |
From Other Comprehensive Income1 |  |  | 348 |  |  |  | 722 |  |  |  | 440 |
Net Periodic Pension Cost2 |  | $ | 2,647 |  |  | $ | 2,979 |  |  | $ | 2,755 |
2Allocation 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 n onservice cost components of postretirement benefits |  |  | 2,229 |  |  |  | 2,571 |  |  |  | 2,465 |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Service Cost–Benefit Earned During the Period |  | $ | 1,286 |  |  | $ | 1,526 |  |  | $ | 1,425 |
Interest Cost on Projected Benefit Obligation |  |  | 3,083 |  |  |  | 2,583 |  |  |  | 2,712 |
Amortization of Prior Service Cost |  |  |  |  |  |  |  |  |  |  |  |
From Regulatory Asset |  |  | - |  |  |  | - |  |  |  | (4 | )
From Other Comprehensive Income1 |  |  | - |  |  |  | - |  |  |  | 4 |
Amortization of Net Actuarial Loss |  |  |  |  |  |  |  |  |  |  |  |
From Regulatory Asset |  |  | 1,571 |  |  |  | 1,648 |  |  |  | 936 |
From Other Comprehensive Income1 |  |  | 38 |  |  |  | 42 |  |  |  | 19 |
Net Periodic Postretirement Benefit Cost2 |  | $ | 5,978 |  |  | $ | 5,799 |  |  | $ | 5,092 |
Effect of Medicare Part D Subsidy |  | $ | (179 | ) |  | $ | (470 | ) |  | $ | (561 | )
2Allocation 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 n onservice cost components of postretirement benefits |  |  | 3,525 |  |  |  | 3,253 |  |  |  | 2,955 |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
(in thousands) |  | 2019 |  |  | 2018 |
Regulatory Assets: |  |  |  |  |  |  |  |
Unrecognized Prior Service Cost |  | $ | - |  |  | $ | 5 |
Unrecognized Actuarial Loss |  |  | 120,592 |  |  |  | 104,891 |
Total Regulatory Assets |  | $ | 120,592 |  |  | $ | 104,896 |
Accumulated Other Comprehensive Loss: |  |  |  |  |  |  |  |
Unrecognized Prior Service Cost |  | $ | - |  |  | $ | 9 |
Unrecognized Actuarial (Gain) Loss |  |  | (82 | ) |  |  | 137 |
Total Accumulated Other Comprehensive Loss |  | $ | (82 | ) |  | $ | 146 |
Noncurrent Liability |  | $ | 55,004 |  |  | $ | 58,659 |
(in thousands) |  | 2019 |  |  | 2018 |
Regulatory Assets: |  |  |  |  |  |  |  |
Unrecognized Prior Service Cost |  | $ | - |  |  | $ | 20 |
Unrecognized Actuarial Loss |  |  | 2,170 |  |  |  | 1,768 |
Total Regulatory Assets |  | $ | 2,170 |  |  | $ | 1,788 |
Projected Benefit Obligation Liability – Net Amount Recognized |  | $ | (43,966 | ) |  | $ | (39,699 | )
Accumulated Other Comprehensive Loss: |  |  |  |  |  |  |  |
Unrecognized Prior Service Cost |  | $ | 1 |  |  | $ | 64 |
Unrecognized Actuarial Loss |  |  | 9,170 |  |  |  | 6,455 |
Total Accumulated Other Comprehensive Loss |  | $ | 9,171 |  |  | $ | 6,519 |
(in thousands) |  | 2019 |  |  | 2018 |
Regulatory Asset: |  |  |  |  |  |  |  |
Unrecognized Prior Service Credit |  | $ | (20,363 | ) |  |  | - |
Unrecognized Net Actuarial Loss (Gain) |  |  | 35,322 |  |  | $ | 18,094 |
Net Regulatory Asset |  | $ | 14,959 |  |  | $ | 18,094 |
Projected Benefit Obligation Liability – Net Amount Recognized |  | $ | (71,437 | ) |  | $ | (71,561 | )
Accumulated Other Comprehensive (Income) Loss: |  |  |  |  |  |  |  |
Unrecognized Prior Service Credit |  | $ | (501 | ) |  |  | - |
Unrecognized Net Actuarial Loss (Gain) |  |  | 184 |  |  | $ | (107 | )
Accumulated Other Comprehensive (Income) Loss: |  | $ | (317 | ) |  | $ | (107 | )
Schedule of Net Funded Status [Table Text Block] |
(in thousands) |  | 2019 |  |  | 2018 |
Accumulated Benefit Obligation |  | $ | (346,723 | ) |  | $ | (297,972 | )
Projected Benefit Obligation |  | $ | (384,785 | ) |  | $ | (328,442 | )
Fair Value of Plan Assets |  |  | 329,781 |  |  |  | 269,783 |
Funded Status |  | $ | (55,004 | ) |  | $ | (58,659 | )
Schedule of Changes in Projected Benefit Obligations and Changes in Plan Assets [Table Text Block] |
(in thousands) |  | 2019 |  |  | 2018 |
Reconciliation of Fair Value of Plan Assets: |  |  |  |  |  |  |  |
Fair Value of Plan Assets at January 1 |  | $ | 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 at December 31 |  | $ | 329,781 |  |  | $ | 269,783 |
Estimated Asset Return |  |  | 19.3 | % |  |  | (7.3 | %)
Reconciliation of Projected Benefit Obligation: |  |  |  |  |  |  |  |
Projected Benefit Obligation at January 1 |  | $ | 328,442 |  |  | $ | 352,718 |
Service Cost |  |  | 5,491 |  |  |  | 6,459 |
Interest Cost |  |  | 14,412 |  |  |  | 13,452 |
Benefit Payments |  |  | (15,142 | ) |  |  | (14,202 | )
Actuarial Loss (Gain) |  |  | 51,582 |  |  |  | (29,985 | )
Projected Benefit Obligation at December 31 |  | $ | 384,785 |  |  | $ | 328,442 |
(in thousands) |  | 2019 |  |  | 2018 |
Reconciliation of Fair Value of Plan Assets: |  |  |  |  |  |  |  |
Fair Value of Plan Assets at January 1 |  | $ | - |  |  | $ | - |
Actual Return on Plan Assets |  |  | - |  |  |  | - |
Employer Contributions |  |  | 1,475 |  |  |  | 1,505 |
Benefit Payments |  |  | (1,475 | ) |  |  | (1,505 | )
Fair Value of Plan Assets at December 31 |  | $ | - |  |  | $ | - |
Reconciliation of Projected Benefit Obligation: |  |  |  |  |  |  |  |
Projected Benefit Obligation at January 1 |  | $ | 39,699 |  |  | $ | 42,308 |
Service Cost |  |  | 418 |  |  |  | 408 |
Interest Cost |  |  | 1,735 |  |  |  | 1,589 |
Benefit Payments |  |  | (1,475 | ) |  |  | (1,505 | )
Curtailments |  |  | (1,671 | ) |  |  | - |
Actuarial Loss (Gain) |  |  | 5,260 |  |  |  | (3,101 | )
Projected Benefit Obligation at December 31 |  | $ | 43,966 |  |  | $ | 39,699 |
(in thousands) |  | 2019 |  |  | 2018 |
Reconciliation of Fair Value of Plan Assets: |  |  |  |  |  |  |  |
Fair Value of Plan Assets at January 1 |  | $ | - |  |  | $ | - |
Actual Return on Plan Assets |  |  | - |  |  |  | - |
Company Contributions |  |  | 2,757 |  |  |  | 3,183 |
Benefit Payments (Net of Medicare Part D Subsidy) |  |  | (7,164 | ) |  |  | (6,684 | )
Participant Premium Payments |  |  | 4,407 |  |  |  | 3,501 |
Fair Value of Plan Assets at December 31 |  | $ | - |  |  | $ | - |
Reconciliation of Projected Benefit Obligation: |  |  |  |  |  |  |  |
Projected Benefit Obligation at January 1 |  | $ | 71,561 |  |  | $ | 69,774 |
Service Cost (Net of Medicare Part D Subsidy) |  |  | 1,286 |  |  |  | 1,526 |
Interest Cost (Net of Medicare Part D Subsidy) |  |  | 3,083 |  |  |  | 2,583 |
Benefit Payments (Net of Medicare Part D Subsidy) |  |  | (7,164 | ) |  |  | (6,684 | )
Participant Premium Payments |  |  | 4,407 |  |  |  | 3,501 |
Plan Amendments |  |  | (20,864 | ) |  |  | - |
Actuarial Loss |  |  | 19,128 |  |  |  | 861 |
Projected Benefit Obligation at December 31 |  | $ | 71,437 |  |  | $ | 71,561 |
Reconciliation of Accrued Postretirement Cost: |  |  |  |  |  |  |  |
Accrued Postretirement Cost at January 1 |  | $ | (53,574 | ) |  | $ | (50,958 | )
Expense |  |  | (5,978 | ) |  |  | (5,799 | )
Net Company Contribution |  |  | 2,757 |  |  |  | 3,183 |
Accrued Postretirement Cost at December 31 |  | $ | (56,795 | ) |  | $ | (53,574 | )
Defined Benefit Plan, Assumptions [Table Text Block] |
|  | 2019 |  |  | 2018 |
Discount Rate |  |  | 3.47 | % |  |  | 4.50 | %
Rate of Increase in Future Compensation Level: |  |  |  |  |  |  |  |
Participants to Age 39 |  |  | 4.50 | % |  |  | 4.50 | %
Participants Age 40 to Age 49 |  |  | 3.50 | % |  |  | 3.50 | %
Participants Age 50 and Older |  |  | 2.75 | % |  |  | 2.75 | %
|  | 2019 |  |  | 2018 |
Discount Rate |  |  | 3.36 | % |  |  | 4.46 | %
Rate of Increase in Future Compensation Level: |  |  | 3.50 | % |  |  | 3.40 | %
|  | 2019 |  |  | 2018 |
Discount Rate |  |  | 3.43 | % |  |  | 4.44 | %
Schedule of Measurement Dates [Table Text Block] |
Measurement Dates: | 2019 | 2018
Net Periodic Pension Cost | January 1, 2019 | January 1, 2018
End of Year Benefit Obligations | January 1, 2019 projected to December 31, 2019 | January 1, 2018 projected to December 31, 2018
Market Value of Assets | December 31, 2019 | December 31, 2018
Measurement Dates: |  | 2019 |  | 2018
Net Periodic Postretirement Benefit Cost |  | January 1, 2019 |  | January 1, 2018
End of Year Benefit Obligations |  | January 1, 2019 projected to December 31, 2019 |  | January 1, 2018 projected to December 31, 2018
Schedule of Expected Benefit Payments [Table Text Block] |
(in thousands) |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | Years 2025-2029 |
|  | $ | 15,908 |  |  | $ | 16,477 |  |  | $ | 17,116 |  |  | $ | 17,768 |  |  | $ | 18,374 |  |  | $ | 98,994 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Years |
(in thousands) |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025-2029 |
|  | $ | 1,571 |  |  | $ | 1,681 |  |  | $ | 2,279 |  |  | $ | 2,680 |  |  | $ | 2,627 |  |  | $ | 13,976 |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Years |
(in thousands) |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | 2024 |  |  | 2025-2029 |
|  | $ | 3,323 |  |  | $ | 3,470 |  |  | $ | 3,653 |  |  | $ | 3,720 |  |  | $ | 3,778 |  |  | $ | 19,852 |
Schedule of Weighted Average Asset Allocation [Table Text Block] |
Asset Allocation |  | 2019 |  |  | 2018 |
Global MGD Volatility Fund (mixed equities fund) |  |  | 20.4 | % |  |  | - |
Large Capitalization Equity Securities |  |  | 11.3 | % |  |  | 17.5 | %
International Equity Securities |  |  | 9.3 | % |  |  | 17.0 | %
Emerging Markets Equity Fund |  |  | 4.2 | % |  |  | 3.4 | %
Small and Mid-Capitalization Equity Securities |  |  | 4.1 | % |  |  | 6.7 | %
SEI Dynamic Asset Allocation Fund |  |  | 3.1 | % |  |  | 4.0 | %
Equity Securities |  |  | 52.4 | % |  |  | 48.6 | %
Fixed-Income Securities and Cash |  |  | 44.7 | % |  |  | 47.1 | %
Other – SEI Energy Debt Collective Fund |  |  | 2.9 | % |  |  | 4.3 | %
|  |  | 100.0 | % |  |  | 100.0 | %
Schedule of Health Care Cost Trend Rates [Table Text Block] |
|  | 2019 |  |  | 2018 |
Healthcare Cost-Trend Rate Assumed for Next Year |  |  | 6.72 | % |  |  | 7.00 | %
Rate to Which the Cost-Trend Rate is Assumed to Decline |  |  | 4.50 | % |  |  | 4.50 | %
Year the Rate Reaches the Ultimate Trend Rate |  | 2038 |  |  | 2038 |
Pension Plan [Member] |
Notes Tables |
Schedule of Assumptions Used in Calculating Net Periodic Benefit Cost [Table Text Block] |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Discount Rate |  |  | 4.50 | % |  |  | 3.90 | % |  |  | 4.60 | %
Long-Term Rate of Return on Plan Assets |  |  | 7.25 | % |  |  | 7.50 | % |  |  | 7.50 | %
Rate of Increase in Future Compensation Level |  | See below |  |  | See below |  |  |  | 3.00 | %
Participants to Age 39 |  |  | 4.50 | % |  |  | 4.50 | % |  |  |  |
Participants Age 40 to Age 49 |  |  | 3.50 | % |  |  | 3.50 | % |  |  |  |
Participants Age 50 and Older |  |  | 2.75 | % |  |  | 2.75 | % |  |  |  |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Discount Rate |  |  | 4.46 | % |  |  | 3.85 | % |  |  | 4.60 | %
Rate of Increase in Future Compensation Level |  |  | 3.40 | % |  |  | 2.92 | % |  |  | 3.00 | %
|  | 2019 |  |  | 2018 |  |  | 2017 |
Discount Rate |  |  | 4.44 | % |  |  | 3.81 | % |  |  | 4.46 | %
Schedule of Target and Tactical Allocation of Plan Assets [Table Text Block] |
|  | Permitted Range
Asset Class / PBO Funded Status |  | < 85% PBO |  | >=85% PBO |  | >=90% PBO |  | >=95% PBO |  | >=100% PBO
Equity |  | 39% | - | 59% |  | 34% | - | 54% |  | 24% | - | 44% |  | 14% | - | 34% |  | 0% | - | 20%
Investment Grade Fixed Income |  | 22% | - | 42% |  | 30% | - | 50% |  | 40% | - | 60% |  | 53% | - | 73% |  | 70% | - | 100%
Below Investment Grade Fixed Income* |  | 0% | - | 15% |  | 0% | - | 15% |  | 0% | - | 15% |  | 0% | - | 10% |  | 0% | - | 10%
Other** |  | 5% | - | 20% |  | 5% | - | 20% |  | 5% | - | 20% |  | 0% | - | 15% |  | 0% | - | 15%
Schedule of Allocation of Plan Assets [Table Text Block] |
(in thousands) |  | 2019 |  |  | 2018 |
Assets in Level 1 of the Fair Value Hierarchy |  | $ | 320,241 |  |  | $ | 258,307 |
SEI Energy Debt Collective Fund at NAV |  |  | 9,540 |  |  |  | 11,476 |
Total Assets |  | $ | 329,781 |  |  | $ | 269,783 |
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] |
(in thousands) |  | 2019 |  |  | 2018 |
Global MGD Volatility Fund (mixed equities fund) |  | $ | 67,184 |  |  | $ | - |
Large Capitalization Equity Securities Mutual Fund |  |  | 37,357 |  |  |  | 47,198 |
International Equity Securities Mutual Funds |  |  | 30,653 |  |  |  | 45,912 |
Small and Mid-Capitalization Equity Securities Mutual Fund |  |  | 13,447 |  |  |  | 17,971 |
SEI Dynamic Asset Allocation Mutual Fund |  |  | 10,168 |  |  |  | 10,929 |
Emerging Markets Equity Fund |  |  | 13,792 |  |  |  | 9,197 |
Fixed Income Securities Mutual Funds |  |  | 147,639 |  |  |  | 127,098 |
Cash Management – Money Market Fund |  |  | 1 |  |  |  | 2 |
Total Assets |  | $ | 320,241 |  |  | $ | 258,307 |

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