Note 5 - Derivative Financial Instruments - Net Derivative Liabilities By Counterparty (Details) - Commodity Contract [Member] $ in Thousands	Jun. 30, 2024 USD ($)
Derivative asset (liabilities)	$ (10,869)
Macquarie Bank Limited [Member]
Derivative liabilities	(7,251)
Mercuria Energy Trading SA [Member]
Derivative liabilities	(1,950)
Wells Fargo Bank, National Association [Member]
Derivative liabilities	(1,858)
Fifth Third Bank, National Association [Member]
Derivative asset	$ 190