Note 6 - Exploratory Well Costs - Exploratory Well Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Beginning capitalized exploratory/extension well costs	$ 28,076	$ 32,592
Additions to exploratory/extension well costs	655,294	189,859
Reclassification to proved properties	(496,943)	(194,375)
Exploratory/extension well costs charged to exploration and abandonment expense	0	0
Ending capitalized exploratory/extension well costs	$ 186,427	$ 28,076