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Note 10 - Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2023
Notes Tables  
Schedule of Asset Retirement Obligations [Table Text Block]
  

September 30, 2023

  

December 31, 2022

 
  

(in thousands)

 

Balance, beginning of year

 $15,442  $1,461 

Acquired or incurred

  10   11,811 

Cost and life revisions

  2,494   1,825 

Plugged

  (131)  (407)

Sold

  -   (189)

Accretion

  812   941 

Balance, end of period

 $18,627  $15,442