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