Note 5 - Derivative Financial Instruments - Net Derivative Liabilities By Counterparty (Details) - Commodity Contract [Member] $ in Thousands	Mar. 31, 2023 USD ($)
Deriviative liabilities	$ (12,062)
Fifth Third Bank, National Association [Member]
Deriviative liabilities	(4,272)
Bank of America, National Association [Member]
Deriviative liabilities	(4,359)
Citizens Bank, National Association [Member]
Deriviative liabilities	$ (3,431)