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

As of September 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 – current

 $  $14,134  $  $14,134 

Commodity price derivatives – noncurrent

     5,268      5,268 

Commodity price derivatives

 $  $19,402  $  $19,402