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Note 3 - Revenue Recognition (Tables)
3 Months Ended
Mar. 31, 2025
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   

Three Months Ended March 31,

 
   

2025

   

2024

 
   

(in thousands)

 

Revenue:

               

Rockies

               

Oil

  $ 1,357     $ 1,721  

Natural gas and liquids

    69       41  

Total

  $ 1,426     $ 1,762  
                 

West Texas, South Texas, and Gulf Coast

               

Oil

  $ 233     $ 1,599  

Natural gas and liquids

    10       46  

Total

  $ 243     $ 1,645  
                 

Mid-Continent

               

Oil

  $ 180     $ 1,407  

Natural gas and liquids

    344       577  

Total

  $ 524     $ 1,984  
                 

Combined Total

  $ 2,193     $ 5,391  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   

Three Months Ended

 
   

March 31,

 
   

2025

   

2024

 

Purchaser A

    46 %     28 %

Purchaser B

    16 %     23 %

Purchaser C

    8 %     11 %