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Note 5 - Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2022
Asset Retirement Obligation Disclosure [Abstract]  
Amounts recorded related to asset retirement obligations

December 31, 

(In thousands)

    

2022

    

2021

Balance at beginning of year

$

22,549

$

15,156

Additional asset retirement obligations acquired/incurred

 

1,440

 

6,919

Expenditures made

(62)

Accretion expense

 

1,115

 

615

Revisions to estimates

 

3,781

 

(79)

Balance at end of year

$

28,885

$

22,549