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Note 8 - Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2024
Notes Tables  
Schedule of Asset Retirement Obligations [Table Text Block]
  

Year Ended December 31,

 
  

2024

  

2023

 
  

(in thousands)

 

Balance, beginning of year

 $18,490  $15,442 

Acquired

  2   11 

Cost and life revisions

  (150)  2,494 

Settlements

  (374)  (215)

Sold

  (5,435)  (458)

Accretion

  1,550   1,216 

Balance, end of year

 $14,083  $18,490 
         

Asset retirement obligations - current

 $1,000  $1,273 

Asset retirement obligations - noncurrent

  13,083   17,217 

Balance, end of year

 $14,083  $18,490