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Note 12 - Financial Instruments and Investment in Partnership (Tables)
12 Months Ended
Dec. 31, 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