Note 12 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	Year Ended December 31,
	2020			2019			2018
Current	$	134		$	(11,092	)	$	35
Deferred		(30,287	)		(64,102	)		500
Total income tax (benefit) expense	$	(30,153	)	$	(75,194	)	$	535

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

	Year Ended December 31,
	2020			2019			2018
Income tax (benefit) expense at the federal statutory rate	$	1,604		$	(233	)	$	52,366
Compensation adjustments		1,373			971			457
State income taxes		75			(175	)		560
Uncertain tax position		—			(11,523	)		—
Impact of U.S. legislative changes		(21,345	)		—			487
Valuation allowance		(12,018	)		(64,704	)		(53,980	)
Other		158			470			645
Total income tax (benefit) expense	$	(30,153	)	$	(75,194	)	$	535

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

	December 31,
	2020			2019
Deferred tax liabilities:
Property and equipment	$	37,535		$	21,647
Derivatives		—			—
Investment in non-consolidated entity		8,070			14,716
Other		2,588			2,283
Total deferred tax liabilities		48,193			38,646
Deferred tax assets:
Property and equipment		—			—
Derivatives		3,416			1,409
Asset retirement obligations		84,332			76,924
Federal net operating losses		47,307			15,265
State net operating losses		8,136			7,393
Interest expense limitation carryover		16,304			48,458
Share-based compensation		419			965
Valuation allowance		(22,361	)		(54,436	)
Other		4,843			6,584
Total deferred tax assets		142,396			102,562
Net deferred tax assets (liabilities)	$	94,203		$	63,916

Summary of Operating Loss Carryforwards [Table Text Block]

	Amount		Expiration Year
Federal net operating loss	$	225,274		earliest is 2037
State net operating loss		136,440		2026-2038
Interest expense limitation carryover		75,341		N/A

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

	December 31,
	2020		2019
Balance, beginning of period	$	—	$	9,482
Decrease during the period		—		(9,482	)
Balance, end of period	$	—	$	—