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Note 4 - Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Related Party Transactions [Table Text Block]
  

In Thousands

 
  

2022

  

2021

  

2020

 

Net profits interest receivable

 $7,170  $6,822  $1,914 

Net profits interests revenue

 $28,207  $17,596  $8,714 

General and administrative amounts payable

 $68  $85  $486 

Total general and administrative expenses

 $3,399  $571  $2,905