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Note 5 - Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of amounts recorded related to asset retirement obligations

December 31, 

(In thousands)

    

2024

    

2023

Balance at beginning of year

$

28,960

$

28,885

Additional asset retirement obligations acquired/incurred

 

470

 

542

Expenditures made

(237)

Accretion expense

 

1,465

 

1,403

Revisions to estimates

 

429

 

(1,870)

Balance at end of year

$

31,087

$

28,960