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Note 13 - Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Change in Asset Retirement Obligation [Table Text Block]

(in thousands)

 As of June 30, 2022  As of December 31, 2021 

Beginning balance

 $40,694  $17,334 

Accretion

  950   1,627 

Additions

     14,564 

Revisions

     7,169 

Ending balance

 $41,644  $40,694