Note 8 - Asset Retirement Obligations - Asset Retirement Obligations Activity (Details) - USD ($) $ in Thousands	3 Months Ended		4 Months Ended		6 Months Ended			8 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020		Jun. 30, 2021		Jun. 30, 2020	Aug. 21, 2020		Dec. 31, 2019
Beginning asset retirement obligations			$ 2,398		$ 2,293		$ 2,212	$ 2,212		$ 520
Liabilities incurred from new wells			84		610			97		1,511
Revision of estimates (a)			(211)	[1]	(10)	[2]		0	[1]	160	[1]
Accretion of discount	$ 37	$ 35	51		72		$ 69	89		72
Ending asset retirement obligations	$ 2,965		$ 2,293		$ 2,965			$ 2,398		$ 2,212

[1] The revisions to the Company’s asset retirement obligation estimates are primarily due to changes in estimated costs based on experience with the properties.

[2] The revisions to the Company’s asset retirement obligation estimates are primarily due to changes in estimated costs based on experience with the properties and their expected useful lives.