Note 5 - Derivative Financial Instruments - Net Derivative Liabilities By Counterparty (Details) - Commodity Contract [Member] $ in Thousands	Sep. 30, 2024 USD ($)
Derivative asset (liabilities)	$ 22,906
Mercuria Energy Trading SA [Member]
Derivative asset	11,792
Fifth Third Bank, National Association [Member]
Derivative asset	7,178
Wells Fargo Bank, National Association [Member]
Derivative asset	3,609
Macquarie Bank Limited [Member]
Derivative asset	$ 327