Note 5 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Oil and gas properties (1)		$ 1,126,056	$ 1,205,044
Accumulated depreciation, depletion, amortization and impairment		(1,082,069)	(1,099,075)
Net property and equipment		43,987	105,969
Oil and Gas Properties [Member]
Oil and gas properties (1)	[1]	1,122,670	1,165,707
Equipment and Other [Member]
Oil and gas properties (1)		$ 3,386	15,257
Equipment and Other [Member] | Minimum [Member]
Estimated Useful Life (Year)		3 years
Equipment and Other [Member] | Maximum [Member]
Estimated Useful Life (Year)		39 years
Drilling Rig [Member]
Oil and gas properties (1)	[1],[2]	$ 0	$ 24,080
Estimated Useful Life (Year)	[1],[2]	15 years

[1] Oil and gas properties are amortized utilizing the units of production method.

[2] The Company owned a 2000 HP drilling rig which was sold in February 2023. The drilling rig was impaired during 2022 resulting in a loss of $8.2 million.