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Note 4 - Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Related Party Transactions [Table Text Block]
   

In Thousands

 
   

2020

   

2019

 

Net profits interests receivable

  $ 1,914     $ 5,882  

Net profits interests revenue

  $ 8,714     $ 15,753  

General and administrative amounts payable

  $ 486     $ 894  

Total general and administrative expenses

  $ 2,905     $ 2,188