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Note 5 - Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Amounts recorded related to asset retirement obligations

 

 

 

 

 

 

 

 

 

December 31, 

(In thousands)

    

2020

    

2019

Balance at beginning of year

 

$

14,605

 

$

12,778

Additional asset retirement obligations acquired/incurred

 

 

 —

 

 

800

Expenditures made

 

 

(105)

 

 

 —

Accretion expense

 

 

570

 

 

511

Revisions to estimates

 

 

86

 

 

516

Balance at end of year

 

$

15,156

 

$

14,605