| Comprehensive Income (Loss) Note [Text Block] | 
    19. Changes in Accumulated Other Comprehensive Income by Component 
     
   Changes to accumulated other comprehensive income by component for the year ended  December 31, 2024 is as follows: 
     
    
|   | 
  | 
  Unrealized   | 
  | 
  | 
  Unrealized   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  Net Gain (Loss)   | 
  | 
  | 
  Net Loss   | 
  | 
  | 
  Retiree   | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  on Interest   | 
  | 
  | 
  on Steel   | 
  | 
  | 
  Health   | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  Rate   | 
  | 
  | 
  Hedging   | 
  | 
  | 
  Benefit   | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  Swap   | 
  | 
  | 
  Instrument   | 
  | 
  | 
  Obligation   | 
  | 
  | 
  Total   | 
  | 
 
|   Balance at December 31, 2023   | 
  | 
$ | 
3,331 | 
  | 
  | 
$ | 
- | 
  | 
  | 
$ | 
3,025 | 
  | 
  | 
$ | 
6,356 | 
  | 
 
|   Other comprehensive gain (loss) before reclassifications   | 
  | 
  | 
1,398 | 
  | 
  | 
  | 
(40 | 
) | 
  | 
  | 
1,031 | 
  | 
  | 
  | 
2,389 | 
  | 
 
|   Amounts reclassified from accumulated other comprehensive income: (1)   | 
  | 
  | 
(2,893 | 
) | 
  | 
  | 
- | 
  | 
  | 
  | 
(380 | 
) | 
  | 
  | 
(3,273 | 
) | 
 
|   Balance at December 31, 2024   | 
  | 
$ | 
1,836 | 
  | 
  | 
$ | 
(40 | 
) | 
  | 
$ | 
3,676 | 
  | 
  | 
$ | 
5,472 | 
  | 
 
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   (1) Amounts reclassified from accumulated other comprehensive income:   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Amortization of Other Postretirement Benefit items:   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Actuarial gains (a)   | 
  | 
$ | 
(514 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Tax expense   | 
  | 
  | 
134 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Reclassification net of tax   | 
  | 
$ | 
(380 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Realized gains on interest rate swaps reclassified to interest expense   | 
  | 
$ | 
(3,910 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Tax expense   | 
  | 
  | 
1,017 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Reclassification net of tax   | 
  | 
$ | 
(2,893 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   (a) – These components are included in the computation of benefit plan costs in Note 12.   | 
  | 
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  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
 
     
     
     
   Changes to accumulated other comprehensive income by component for the year ended  December 31, 2023 is as follows: 
     
    
|   | 
  | 
  Unrealized   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  Net Gain (Loss)   | 
  | 
  | 
  Retiree   | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  on Interest   | 
  | 
  | 
  Health   | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  Rate   | 
  | 
  | 
  Benefit   | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  Swap   | 
  | 
  | 
  Obligation   | 
  | 
  | 
  Total   | 
  | 
 
|   Balance at December 31, 2022   | 
  | 
$ | 
6,115 | 
  | 
  | 
$ | 
3,013 | 
  | 
  | 
$ | 
9,128 | 
  | 
 
|   Other comprehensive gain before reclassifications   | 
  | 
  | 
607 | 
  | 
  | 
  | 
411 | 
  | 
  | 
  | 
1,018 | 
  | 
 
|   Amounts reclassified from accumulated other comprehensive income: (1)   | 
  | 
  | 
(3,391 | 
) | 
  | 
  | 
(399 | 
) | 
  | 
  | 
(3,790 | 
) | 
 
|   Balance at December 31, 2023   | 
  | 
$ | 
3,331 | 
  | 
  | 
$ | 
3,025 | 
  | 
  | 
$ | 
6,356 | 
  | 
 
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   (1) Amounts reclassified from accumulated other comprehensive income:   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Amortization of Other Postretirement Benefit items:   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Actuarial gains (a)   | 
  | 
$ | 
(539 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Tax expense   | 
  | 
  | 
140 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Reclassification net of tax   | 
  | 
$ | 
(399 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Realized gains on interest rate swaps reclassified to interest expense   | 
  | 
$ | 
(4,583 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Tax expense   | 
  | 
  | 
1,192 | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
|   Reclassification net of tax   | 
  | 
$ | 
(3,391 | 
) | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
 
     
   
|   (a)   – These components are included in the computation of benefit plan costs in Note 12.   |  
 
     
  
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