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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension Plan [Member]        
Service Cost—Benefit Earned During the Period $ 1,655 $ 1,373 $ 4,966 $ 4,119
Interest Cost on Projected Benefit Obligation 3,264 3,603 9,790 10,809
Expected Return on Assets (5,506) (5,324) (16,516) (15,973)
From Regulatory Asset 0 1 0 4
From Other Comprehensive Income [1] 0 2 0 6
From Regulatory Asset 2,231 1,163 6,693 3,488
From Other Comprehensive Income [1] 55 26 165 79
Net Periodic Pension Cost [2] 1,699 844 5,098 2,532
From Other Comprehensive Income [1] 55 26 165 79
Pension Plan [Member] | Costs Included in Electric Operation and Maintenance Expenses [Member]        
Net Periodic Pension Cost 1,099 1,007 3,476 2,961
Pension Plan [Member] | Costs Included in OTP Capital Expenditures [Member]        
Net Periodic Pension Cost 516 333 1,371 1,059
Pension Plan [Member] | Costs Included in Other Nonelectric Expenses [Member]        
Net Periodic Pension Cost 40 33 119 99
Pension Plan [Member] | Nonservice Costs Included in Nonservice Cost Components of Postretirement Benefits [Member]        
Net Periodic Pension Cost 31 (401) 96 (1,179)
Pension Plan [Member] | Nonservice Costs Capitalized as Regulatory Assets [Member]        
Net Periodic Pension Cost 13 (128) 36 (408)
Executive Survivor and Supplemental Retirement Plan [Member]        
Service Cost—Benefit Earned During the Period 45 104 134 313
Interest Cost on Projected Benefit Obligation 362 433 1,086 1,301
From Regulatory Asset 0 2 0 4
From Other Comprehensive Income [1] 0 4 0 12
From Regulatory Asset 24 31 71 93
From Other Comprehensive Income [1] 85 87 256 262
Net Periodic Pension Cost [3] 516 661 1,547 1,985
From Other Comprehensive Income [1] 85 87 256 262
Executive Survivor and Supplemental Retirement Plan [Member] | Costs Included in Electric Operation and Maintenance Expenses [Member]        
Net Periodic Pension Cost 0 26 0 78
Executive Survivor and Supplemental Retirement Plan [Member] | Costs Included in Other Nonelectric Expenses [Member]        
Net Periodic Pension Cost 45 78 134 235
Executive Survivor and Supplemental Retirement Plan [Member] | Nonservice Costs Included in Nonservice Cost Components of Postretirement Benefits [Member]        
Net Periodic Pension Cost 471 557 1,413 1,672
Other Postretirement Benefits Plan [Member]        
Service Cost—Benefit Earned During the Period 461 321 1,385 964
Interest Cost on Projected Benefit Obligation 598 770 1,795 2,312
From Regulatory Asset (1,169) 0 (3,508) 0
From Other Comprehensive Income [1] (28) 0 (86) 0
From Regulatory Asset 1,051 393 3,154 1,178
From Other Comprehensive Income [1] 26 10 78 29
Net Periodic Pension Cost [4] 939 1,494 2,818 4,483
From Other Comprehensive Income [1] 26 10 78 29
Effect of Medicare Part D Subsidy 281 (45) 842 (134)
Other Postretirement Benefits Plan [Member] | Costs Included in Electric Operation and Maintenance Expenses [Member]        
Net Periodic Pension Cost 306 235 970 693
Other Postretirement Benefits Plan [Member] | Costs Included in OTP Capital Expenditures [Member]        
Net Periodic Pension Cost 144 78 382 248
Other Postretirement Benefits Plan [Member] | Costs Included in Other Nonelectric Expenses [Member]        
Net Periodic Pension Cost 11 8 33 23
Other Postretirement Benefits Plan [Member] | Nonservice Costs Included in Nonservice Cost Components of Postretirement Benefits [Member]        
Net Periodic Pension Cost 328 889 1,037 2,614
Other Postretirement Benefits Plan [Member] | Nonservice Costs Capitalized as Regulatory Assets [Member]        
Net Periodic Pension Cost $ 150 $ 284 $ 396 $ 905
[1] Corporate cost included in nonservice cost components of postretirement benefits.
[2] Allocation of costs: Service costs included in OTP capital expenditures $ 516 $ 333 $ 1,371 $ 1,059 Service costs included in electric operation and maintenance expenses 1,099 1,007 3,476 2,961 Service costs included in other nonelectric expenses 40 33 119 99 Nonservice costs capitalized as regulatory assets 13 (128 ) 36 (408 ) Nonservice costs included in nonservice cost components of postretirement benefits 31 (401 ) 96 (1,179 )
[3] Allocation of Costs: Service costs included in electric operation and maintenance expenses $ - $ 26 $ - $ 78 Service costs included in other nonelectric expenses 45 78 134 235 Nonservice costs included in nonservice cost components of postretirement benefits 471 557 1,413 1,672
[4] Allocation of Costs: Service costs included in OTP capital expenditures $ 144 $ 78 $ 382 $ 248 Service costs included in electric operation and maintenance expenses 306 235 970 693 Service costs included in other nonelectric expenses 11 8 33 23 Nonservice costs capitalized as regulatory assets 150 284 396 905 Nonservice costs included in nonservice cost components of postretirement benefits 328 889 1,037 2,614