Note 13 - Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
NOL and capital loss carryforwards	$ 5,019	$ 6,014
Business interest expense	2,333	2,534
Start-up costs (crude oil and condensate processing facility)	233	254
ARO liability/deferred revenue	630	946
Other	59	54
Total deferred tax assets	8,274	9,802
Basis differences in property and equipment	(8,383)	(8,366)
Total deferred tax liabilities	(8,383)	(8,366)
Deferred Tax Assets (Liabilities), Gross	(109)	1,436
Deferred liabilities, net	$ (109)
Deferred tax assets, net		$ 1,436