Note 4 - Fair Value Measurements - Assets and Liabilities Measured On Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Commodity price derivatives – current	$ 1,726	$ 4,133
Derivatives	27,776	16,702
Derivatives	3,743	691
Commodity Contract [Member]
Total liabilities	(27,242)
Commodity Contract [Member] | Fair Value, Recurring [Member]
Commodity price derivatives – current	3,247
Commodity price derivatives	4,277	17
Commodity price derivatives – current	1,030
Derivatives	27,776	16,702
Total liabilities	4,277	17
Derivatives	3,743	691
Total liabilities	31,519	17,393
Total recurring fair value measurements	(27,242)	(17,376)
Commodity Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Commodity price derivatives – current	0
Commodity price derivatives	0	0
Commodity price derivatives – current	0
Derivatives	0	0
Total liabilities	0	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]
Commodity price derivatives – current	3,247
Commodity price derivatives	4,277	17
Commodity price derivatives – current	1,030
Derivatives	27,776	16,702
Total liabilities	4,277	17
Derivatives	3,743	691
Total liabilities	31,519	17,393
Total recurring fair value measurements	(27,242)	(17,376)
Commodity Contract [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Commodity price derivatives – current	0
Commodity price derivatives	0	0
Commodity price derivatives – current	0
Derivatives	0	0
Total liabilities	0	0
Derivatives	0	0
Total liabilities	0	0
Total recurring fair value measurements	$ 0	$ 0