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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