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Note 7 - Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Quoted Prices in Active Markets for Identical Assets (Level 1)

   

Significant Other
Observable Inputs
(Level 2)

   

Significant Unobservable Inputs (Level 3)

   

Balance as of December 31, 2021

 

Liabilities:

                               

NYMEX fixed price derivative contracts

  $     $ 442     $     $ 442  

Total Liabilities

  $     $ 442     $ -     $ 442