Note 5 - Derivative Financial Instruments - Net Derivative Liabilities By Counterparty (Details) - Commodity Contract [Member] $ in Thousands	Dec. 31, 2024 USD ($)
Derivative assets (liabilities), net	$ 2,202
Mercuria Energy Trading SA [Member]
Derivative assets	3,693
Fifth Third Bank, National Association [Member]
Derivative assets	2,735
Wells Fargo Bank, National Association [Member]
Derivative liabilities	(811)
Macquarie Bank Limited [Member]
Derivative liabilities	$ (3,415)