Note 13 - Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Loss carryforwards U.S. - Federal/States	$ 6,598	$ 15,975
Asset retirement obligations	6,359	5,175
Accrued expenses	3,257	744
Stock-based compensation	2,249	2,331
Total deferred tax assets	18,463	24,225
Deferred tax liabilities:
Depreciation & amortization	(54,100)	(30,631)
Net deferred tax liabilities	$ (35,637)	$ (6,406)