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Note 7 - Revenue (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2024

  

2023

  

2024

  

2023

 

Delivered energy (including contract liability amortization)

 $39,973  $53,862  $86,955  $130,284 

Capacity

  16,873   17,155   28,646   33,125 

Total Electric Operations sales

 $56,846  $71,017  $115,601  $163,409 
Revenue from External Customers by Geographic Areas [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 
  

2024

  

2023

  

2024

  

2023

 

Outside third-party Indiana customers

 $15,048  $34,214  $33,152  $83,650 

Customers in Florida, North Carolina, Alabama and Georgia

  17,753   54,360   49,279   99,526 

Total Coal Operations sales

 $32,801  $88,574  $82,431  $183,176