Note 11 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
(In thousands)	2018			2017		2016
Current taxes:
Federal	$	—		$	—	$	—
State		4			—		—
Current taxes		4			—		—
Deferred taxes:
Federal		(111	)		—		—
State		220			—		—
Deferred taxes		109			—		—
Provision for income taxes, net	$	113		$	—	$	—

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended December 31,
(In thousands)	2018			2017			2016
Income taxes computed at the federal statutory rate	$	5,289		$	(5,242	)	$	(2,555	)
Effect of:
(Income) loss taxed as partnership		—			(552	)		2,555
State taxes, net of federal benefits		970			(610	)		—
Percentage depletion		(1,033	)		—			—
Changes in tax status		—			(205	)		—
Change in valuation allowance		(4,464	)		4,464			—
Change in enacted tax rates		—			2,119			—
Other, net		(649	)		26			—
Total	$	113		$	—		$	—

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
(In thousands)	2018			2017
Deferred tax assets:
Loss carryforwards U.S. - Federal/States	$	17,073		$	13,500
Asset retirement obligations		3,306			3,178
Accrued expenses		521			—
Equity-based compensation		1,393			803
Other		4			—
Total deferred tax assets		22,297			17,481
Less valuation allowance		—			(4,464	)
Deferred tax assets, net		22,297			13,017
Deferred tax liabilities:
Depreciation & amortization		(22,406	)		(13,017	)
Net deferred tax liabilities, net of valuation allowance	$	(109	)	$	—