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Note 5 - Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2023
Asset Retirement Obligation Disclosure [Abstract]  
Amounts recorded related to asset retirement obligations

December 31, 

(In thousands)

    

2023

    

2022

Balance at beginning of year

$

28,885

$

22,549

Additional asset retirement obligations acquired/incurred

 

542

 

1,440

Expenditures made

Accretion expense

 

1,403

 

1,115

Revisions to estimates

 

(1,870)

 

3,781

Balance at end of year

$

28,960

$

28,885