Note 2 - Basis of Presentation and Summary of Significant Accounting Policies - Other Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Aug. 22, 2020
Other property and equipment, net	$ 1,600	$ 1,092	$ 436
Land [Member]
Other property and equipment, net	1,122	725
Technology Equipment [Member]
Other property and equipment, net	125	292
Transportation Equipment [Member]
Other property and equipment, net	202	41
Leasehold Improvements [Member]
Other property and equipment, net	143	24
Field Equipment [Member]
Other property and equipment, net	$ 8	$ 10