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Note 13 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2024
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

As of December 31, 2023

                                           

Net Fair Value

 
   

Quoted Prices

                                   

Presented in the

 
   

in Active Markets

   

Significant Other

   

Significant

                   

Unaudited

 
   

for Identical

   

Observable

   

Unobservable

                   

Condensed

 
   

Assets

   

Inputs

   

Inputs

   

Total Gross

   

Effect of

   

Consolidated

 
   

(Level 1)

   

(Level 2)

   

(Level 3)

   

Fair Value

   

Netting

   

Balance Sheet

 

(in thousands)

 

Assets

                                               

Current:

                                               

Commodity derivatives

  $ -     $ 1,844     $ -     $ 1,844     $ -     $ 1,844  
                                                 

Net commodity derivative instruments

  $ -     $ 1,844     $ -     $ 1,844     $ -     $ 1,844  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   

September 30, 2024

   

December 31, 2023

 

Current assets:

               

Marketable equity securities

               

Number of shares owned

    2,421,180       2,421,180  

Quoted market price

  $ 0.04439     $ 0.06789  
                 

Fair value of marketable equity securities

  $ 107,474     $ 164,375