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Note 8 - Other Operating Income (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Other Operating Income (Expense) [Table Text Block]
  

Year Ended December 31,

 
  

2020

  

2019

 

Equity income (loss) - Sunrise Energy

 $1,054  $(527)

MSHA reimbursements

  400   575 

Gain on sale of royalty interests in oil properties

     2,949 

Miscellaneous

  1,757   3,029 
  $3,211  $6,026