Note 5 - Derivative Financial Instruments - Net Derivative Liabilities By Counterparty (Details) - Commodity Contract [Member] $ in Thousands	Mar. 31, 2025 USD ($)
Derivative asset (liabilities)	$ (2,655)
Macquarie Bank Limited [Member]
Derivative asset	(2,812)
Wells Fargo Bank, National Association [Member]
Derivative asset	(1,200)
Fifth Third Bank, National Association [Member]
Derivative asset	(583)
Mercuria Energy Trading SA [Member]
Derivative asset	$ 1,940