Note 3 - Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

	Price Swaps
		Volume		Weighted Average Price
Period	Commodity	(Bbls / MMBtu)		($/Bbl / $/MMBtu)
Q4 2020	Crude Oil		552,000	$	60.65
Q1 - Q4 2021	Crude Oil		1,460,000	$	55.16
Q4 2020	Crude Oil Basis Swap (1)		598,000	$	(1.50	)
Q4 2020	Crude Oil Basis Swap (2)		92,000	$	2.55
Q4 2020	Crude Oil Roll Swap (3)		552,000	$	(1.79	)
Q1 - Q4 2021	Crude Oil Basis Swap (1)		1,825,000	$	1.05
Q4 2020	Natural Gas		644,000	$	2.85
Q1 - Q4 2021	Natural Gas		4,380,000	$	2.76
Q4 2020	Natural Gas Basis Swap (4)		644,000	$	(1.07	)
Q1 - Q4 2021	Natural Gas Basis Swap (4)		4,380,000	$	(0.45	)

Schedule of Interest Rate Derivatives [Table Text Block]

Effective Dates	Notional Amount		Fixed Rate
May 5, 2020 to May 5, 2022	$	125,000,000		0.286	%
May 5, 2022 to May 5, 2023	$	100,000,000		0.286	%
May 5, 2023 to May 7, 2024	$	75,000,000		0.286	%

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

		September 30, 2020							December 31, 2019
Derivatives not		Gross					Net		Gross					Net
designated as hedging	Balance	Recognized		Gross			Recognized		Recognized		Gross			Recognized
contracts under ASC	Sheet	Assets /		Amounts			Assets /		Assets /		Amounts			Assets /
Topic 815	Location	Liabilities		Offset			Liabilities		Liabilities		Offset			Liabilities
Commodity contracts	Derivative asset - current	$	26,773	$	(1,676	)	$	25,097	$	13,321	$	(4,461	)	$	8,860
Commodity contracts	Derivative liability - current	$	2,539	$	(1,676	)	$	863	$	11,350	$	(4,461	)	$	6,889
Interest rate swaps	Derivative liability - current	$	177	$	—		$	177	$	—	$	—		$	—
Commodity contracts	Derivative asset - noncurrent	$	4,727	$	—		$	4,727	$	1,031	$	(261	)	$	770
Commodity contracts	Derivative liability - noncurrent	$	355	$	—		$	355	$	261	$	(261	)	$	—
Interest rate swaps	Derivative liability - noncurrent	$	222	$	—		$	222	$	—	$	—		$	—

Derivatives Not Designated as Hedging Instruments [Table Text Block]

			Three Months Ended					Nine Months Ended
Derivatives not designated as hedging contracts under ASC Topic 815			September 30,					September 30,
	Statement of Cash Flows Location	Statement of Operations Location	2020			2019		2020		2019
Unrealized (loss) gain	Not separately presented	Not separately presented	$	(14,543	)	$	15,021	$	25,466	$	(33,332	)
Realized gain	Operating portion of net cash received in settlement of derivative contracts	Not separately presented		8,503			3,705		47,599		13,660
	Total (loss) gain on derivative contracts, net	(Loss) gain on derivative contracts, net	$	(6,040	)	$	18,726	$	73,065	$	(19,672	)