Note 5 - Derivative Financial Instruments - Net Derivative Liabilities By Counterparty (Details) - Commodity Contract [Member] $ in Thousands	Mar. 31, 2024 USD ($)
Derivative asset (liabilities)	$ (13,475)
Macquarie Bank Limited [Member]
Derivative liabilities	(11,413)
Wells Fargo Bank, National Association [Member]
Derivative liabilities	(1,629)
Mercuria Energy Trading SA [Member]
Derivative liabilities	(806)
Fifth Third Bank, National Association [Member]
Derivative asset	$ 373