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Note 4 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
  

As of June 30, 2021

 
  

Quoted Prices in

Active Markets for

Identical Assets

(Level 1)

  

Significant Other

Observable Inputs

(Level 2)

  

Significant

Unobservable

Inputs (Level 3)

  

Total

 

Liabilities:

                

Commodity price derivatives

 $-  $12,558  $-  $12,558