Note 2 - Basis of Presentation and Summary of Significant Accounting Policies - Other Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Aug. 22, 2020	Dec. 31, 2019
Other property and equipment, net	$ 415	$ 436	$ 508
Technology Equipment [Member]
Other property and equipment, net	333		459
Transportation Equipment [Member]
Other property and equipment, net	44
Leasehold Improvements [Member]
Other property and equipment, net	27		37
Field Equipment [Member]
Other property and equipment, net	$ 11		$ 12