Note 14 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Expense (Benefit), Total	$ 130	$ 575	$ 112	$ 728
Deferred Income Tax Expense (Benefit), Total			112	728
Earthstone Energy Holdings Limited Liability Company [Member]
Deferred Income Tax Expense (Benefit), Total			100	(600)
Lynden USA Inc. [Member]
Income Tax Expense (Benefit), Total			$ (800)	(100)
Deferred Income Tax Expense (Benefit), Total				$ 600