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Note 11 - Pension Plan and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Pension Plan [Member]    
Service Cost—Benefit Earned During the Period $ 1,655 $ 1,373
Interest Cost on Projected Benefit Obligation 3,263 3,603
Expected Return on Assets (5,505) (5,325)
From Regulatory Asset 0 1
From Other Comprehensive Income [1] 0 2
From Regulatory Asset 2,231 1,163
From Other Comprehensive Income [1] 55 27
Net Periodic Pension Cost [2] 1,699 844
From Other Comprehensive Income [1] 55 27
From Regulatory Asset (2,231) (1,163)
Pension Plan [Member] | Costs Included in Electric Operation and Maintenance Expenses [Member]    
Net Periodic Pension Cost 1,192 950
Pension Plan [Member] | Costs Included in OTP Capital Expenditures [Member]    
Net Periodic Pension Cost 423 390
Pension Plan [Member] | Costs Included in Other Nonelectric Expenses [Member]    
Net Periodic Pension Cost 40 33
Pension Plan [Member] | Nonservice Costs Included in Nonservice Cost Components of Postretirement Benefits [Member]    
Net Periodic Pension Cost 33 (379)
Pension Plan [Member] | Nonservice Costs Capitalized as Regulatory Assets [Member]    
Net Periodic Pension Cost 11 (150)
Executive Survivor and Supplemental Retirement Plan [Member]    
Service Cost—Benefit Earned During the Period 45 105
Interest Cost on Projected Benefit Obligation 362 434
From Regulatory Asset 0 1
From Other Comprehensive Income [3] 0 4
From Regulatory Asset 23 31
From Other Comprehensive Income [3] 86 87
Net Periodic Pension Cost [4] 516 662
From Other Comprehensive Income [3] 86 87
From Regulatory Asset (23) (31)
Executive Survivor and Supplemental Retirement Plan [Member] | Costs Included in Electric Operation and Maintenance Expenses [Member]    
Net Periodic Pension Cost 0 26
Executive Survivor and Supplemental Retirement Plan [Member] | Costs Included in Other Nonelectric Expenses [Member]    
Net Periodic Pension Cost 45 79
Executive Survivor and Supplemental Retirement Plan [Member] | Nonservice Costs Included in Nonservice Cost Components of Postretirement Benefits [Member]    
Net Periodic Pension Cost 471 557
Other Postretirement Benefits Plan [Member]    
Service Cost—Benefit Earned During the Period 462 321
Interest Cost on Projected Benefit Obligation 598 770
From Regulatory Asset (1,169) 0
From Other Comprehensive Income [1] (29) 0
From Regulatory Asset (1,051) (393)
From Other Comprehensive Income [1] 26 10
Net Periodic Pension Cost [5] 939 1,494
From Other Comprehensive Income [1] 26 10
From Regulatory Asset 1,051 393
Effect of Medicare Part D Subsidy 281 (45)
Other Postretirement Benefits Plan [Member] | Costs Included in Electric Operation and Maintenance Expenses [Member]    
Net Periodic Pension Cost 333 223
Other Postretirement Benefits Plan [Member] | Costs Included in OTP Capital Expenditures [Member]    
Net Periodic Pension Cost 118 91
Other Postretirement Benefits Plan [Member] | Costs Included in Other Nonelectric Expenses [Member]    
Net Periodic Pension Cost 11 7
Other Postretirement Benefits Plan [Member] | Nonservice Costs Included in Nonservice Cost Components of Postretirement Benefits [Member]    
Net Periodic Pension Cost 355 840
Other Postretirement Benefits Plan [Member] | Nonservice Costs Capitalized as Regulatory Assets [Member]    
Net Periodic Pension Cost $ 122 $ 333
[1] Corporate cost included in nonservice cost components of postretirement benefits.
[2] Allocation of costs: Service costs included in OTP capital expenditures $ 423 $ 390 Service costs included in electric operation and maintenance expenses 1,192 950 Service costs included in other nonelectric expenses 40 33 Nonservice costs capitalized as regulatory assets 11 (150 ) Nonservice costs included in nonservice cost components of postretirement benefits 33 (379 )
[3] Amortization of prior service costs and net actuarial losses from other comprehensive income are included in nonservice cost components of postretirement benefits.
[4] Allocation of Costs: Service costs included in electric operation and maintenance expenses $ - $ 26 Service costs included in other nonelectric expenses 45 79 Nonservice costs included in nonservice cost components of postretirement benefits 471 557
[5] Allocation of Costs: Service costs included in OTP capital expenditures $ 118 $ 91 Service costs included in electric operation and maintenance expenses 333 223 Service costs included in other nonelectric expenses 11 7 Nonservice costs capitalized as regulatory assets 122 333 Nonservice costs included in nonservice cost components of postretirement benefits 355 840