Note 4 - Fair Value Measurements - Assets and Liabilities Measured On Recurring Basis 2 (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Derivatives	$ 11,265	$ 16,702
Derivatives	797	691
Commodity Contract [Member]
Total liabilities	12,062
Commodity Contract [Member] | Fair Value, Recurring [Member]
Derivatives	11,265	16,702
Commodity price derivatives		17
Derivatives	797	691
Total liabilities	12,062	17,393
Total recurring fair value measurements	(12,062)	(17,376)
Commodity Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivatives	0	0
Commodity price derivatives		0
Derivatives	0	0
Total liabilities	0	0
Total recurring fair value measurements	0	0
Commodity Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives	11,265	16,702
Commodity price derivatives		17
Derivatives	797	691
Total liabilities	12,062	17,393
Total recurring fair value measurements	(12,062)	(17,376)
Commodity Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivatives	0	0
Commodity price derivatives		0
Derivatives	0	0
Total liabilities	0	0
Total recurring fair value measurements	$ 0	$ 0