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Note 4 - Asset Impairments (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]
  

Three Months Ended September 30, 2020

  

Nine Months Ended September 30, 2020

 

Proved property

 $  $25,252 

Unproved property

  2,115   19,676 

Goodwill

     17,620 

Impairment expense

 $2,115  $62,548