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Note 5 - Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Amounts recorded related to asset retirement obligations

December 31, 

(In thousands)

    

2021

    

2020

Balance at beginning of year

$

15,156

$

14,605

Additional asset retirement obligations acquired/incurred

 

6,919

 

Expenditures made

(62)

(105)

Accretion expense

 

615

 

570

Revisions to estimates

 

(79)

 

86

Balance at end of year

$

22,549

$

15,156