Capitalized costs oil and gas producing activities, total.

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Percentage of working interest interest in wells.

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Supervision fees.

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WTI May 2020 Pricing

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table.

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The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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Nominal number of units used to calculate payment on derivative.

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Average fixed price related to the group of price risk swap derivatives.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The sum of amounts currently receivable other than from customers. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Portion of accounts receivable attributable to joint interest partners in oil and gas properties. These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells.

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Amount due from parties in nontrade transactions, classified as other.

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Summary of Significant Accounting Policies (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) bbl MMBTU $ / MMBTU $ / Boe shares	Mar. 31, 2019 USD ($) shares	May 04, 2020 bbl MMBTU $ / MMBTU $ / Boe	Apr. 21, 2020	Dec. 31, 2019 USD ($)
Summary of Significant Accounting Policies
Total capitalized internal costs \| $	$ 1,100	$ 1,600
Proved oil and gas properties \| $	1,251,110				$ 1,201,296
Unproved oil and gas properties \| $	42,249				41,201
Furniture, fixtures, and other equipment \| $	5,094				5,220
Less - Accumulated depreciation, depletion, and amortization \| $	(499,759)				(380,728)
Net Furniture, Fixtures and other equipment \| $	798,694				866,989
Write-down of oil and gas properties \| $	95,606	0
Allowance for doubtful accounts receivable, current \| $	100				100
Accounts receivable, gross \| $	14,100				24,600
Accounts receivable related to joint interest owners \| $	3,000				3,700
Severance tax receivable \| $	5,900				5,400
Other receivables \| $	$ 7,300				3,300
Percentage of working interest in wells	100.00%
Total amount of supervision fees charged to wells \| $	$ 1,200	1,300
Income Tax Expense (Benefit) \| $	(1,241)	232
Oil and gas sales \| $	53,377	$ 72,064
Trade accounts payable \| $	27,409				26,121
Accrued operating expenses \| $	3,388				3,873
Accrued payroll costs \| $	1,865				4,601
Asset retirement obligation - current portion \| $	387				392
Accrued non-income based taxes \| $	2,042				1,413
Accrued corporate and legal fees \| $	247				109
Other payables \| $	821				2,834
Accounts payable and accrued liabilities \| $	$ 36,159				$ 39,343
Purchase of treasury stock (shares) \| shares	26,675	11,076
Oil sales [Member]
Summary of Significant Accounting Policies
Oil and gas sales \| $	$ 18,050	$ 14,607
Natural gas sales [Member]
Summary of Significant Accounting Policies
Oil and gas sales \| $	31,472	51,304
NGL sales [Member]
Summary of Significant Accounting Policies
Oil and gas sales \| $	$ 3,855	$ 6,154
Subsequent Event [Member]
Summary of Significant Accounting Policies
WTI May 2020 Pricing				10
Basis Swap [Member] \| Second Quarter 2020 [Member] \| Oil Basis Derivative [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| bbl	227,500
Derivative, Swap Type, Fixed Price \| $ / MMBTU	0.49
Basis Swap [Member] \| Second Quarter 2020 [Member] \| Oil Basis Derivative [Member] \| Subsequent Event [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| bbl			66,000
Derivative, Swap Type, Fixed Price \| $ / MMBTU			3.35
Basis Swap [Member] \| Fourth Quarter 2020 [Member] \| Oil Basis Derivative [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| bbl	230,000
Derivative, Swap Type, Fixed Price \| $ / MMBTU	0.49
Swap [Member] \| Second Quarter 2020 [Member] \| Natural Gas Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU	7,430,000
Derivative, Swap Type, Fixed Price \| $ / MMBTU	2.62
Swap [Member] \| Second Quarter 2020 [Member] \| Oil Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| bbl	359,126
Derivative, Swap Type, Fixed Price \| $ / Boe	53.60
Swap [Member] \| Second Quarter 2020 [Member] \| Oil Derivative Swaps [Member] \| Subsequent Event [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| bbl			(93,450)
Derivative, Swap Type, Fixed Price \| $ / Boe			17.69
Swap [Member] \| Fourth Quarter 2020 [Member] \| Natural Gas Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU	7,042,000
Derivative, Swap Type, Fixed Price \| $ / MMBTU	2.63
Swap [Member] \| Fourth Quarter 2020 [Member] \| Natural Gas Derivative Swaps [Member] \| Subsequent Event [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU			775,000
Derivative, Swap Type, Fixed Price \| $ / MMBTU			2.69
Swap [Member] \| Fourth Quarter 2020 [Member] \| Oil Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| bbl	244,556
Derivative, Swap Type, Fixed Price \| $ / Boe	52.76
Swap [Member] \| First Quarter 2021 [Member] \| Natural Gas Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU	148,078
Derivative, Swap Type, Fixed Price \| $ / MMBTU	2.70
Swap [Member] \| First Quarter 2021 [Member] \| Natural Gas Derivative Swaps [Member] \| Subsequent Event [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU			2,250,000
Derivative, Swap Type, Fixed Price \| $ / MMBTU			2.74
Swap [Member] \| First Quarter 2021 [Member] \| Oil Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| bbl	215,538
Derivative, Swap Type, Fixed Price \| $ / Boe	51.93
Swap [Member] \| Second Quarter 2021 [Member] \| Natural Gas Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU	442,255
Derivative, Swap Type, Fixed Price \| $ / MMBTU	2.30
Swap [Member] \| Second Quarter 2021 [Member] \| Natural Gas Derivative Swaps [Member] \| Subsequent Event [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU			195,000
Derivative, Swap Type, Fixed Price \| $ / MMBTU			2.59
Swap [Member] \| Second Quarter 2021 [Member] \| Oil Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| bbl	195,646
Derivative, Swap Type, Fixed Price \| $ / Boe	51.93
Swap [Member] \| Third Quarter 2021 [Member] \| Natural Gas Derivative Swaps [Member] \| Subsequent Event [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU			165,000
Derivative, Swap Type, Fixed Price \| $ / MMBTU			2.65
Swap [Member] \| Third Quarter 2021 [Member] \| Oil Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| bbl	179,759
Derivative, Swap Type, Fixed Price \| $ / Boe	51.19
Swap [Member] \| Fourth Quarter 2021 [Member] \| Natural Gas Derivative Swaps [Member] \| Subsequent Event [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU			150,000
Derivative, Swap Type, Fixed Price \| $ / MMBTU			2.71
Swap [Member] \| Fourth Quarter 2021 [Member] \| Oil Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| bbl	163,812
Derivative, Swap Type, Fixed Price \| $ / Boe	52.39
Swap [Member] \| First Quarter 2022 [Member] [Member] \| Oil Derivative Swaps [Member] \| Subsequent Event [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| bbl			45,000
Derivative, Swap Type, Fixed Price \| $ / Boe			38.55
Collar Contracts [Member] \| Fourth Quarter 2020 [Member] \| Natural Gas Derivative Swaps [Member] \| Subsequent Event [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU			310,000
Derivative, Average Floor Price \| $ / MMBTU			2.60
Derivative, Average Cap Price \| $ / MMBTU			3.06
Collar Contracts [Member] \| First Quarter 2021 [Member] \| Natural Gas Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU	5,227,800
Derivative, Average Floor Price \| $ / MMBTU	2.50
Derivative, Average Cap Price \| $ / MMBTU	3.40
Collar Contracts [Member] \| First Quarter 2021 [Member] \| Natural Gas Derivative Swaps [Member] \| Subsequent Event [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU			1,800,000
Derivative, Average Floor Price \| $ / MMBTU			2.60
Derivative, Average Cap Price \| $ / MMBTU			3.14
Collar Contracts [Member] \| Second Quarter 2021 [Member] \| Natural Gas Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU	4,546,000
Derivative, Average Floor Price \| $ / MMBTU	2.18
Derivative, Average Cap Price \| $ / MMBTU	2.69
Collar Contracts [Member] \| Third Quarter 2021 [Member] \| Natural Gas Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU	4,665,175
Derivative, Average Floor Price \| $ / MMBTU	2.02
Derivative, Average Cap Price \| $ / MMBTU	2.65
Collar Contracts [Member] \| Fourth Quarter 2021 [Member] \| Natural Gas Derivative Swaps [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU	4,391,000
Derivative, Average Floor Price \| $ / MMBTU	2.25
Derivative, Average Cap Price \| $ / MMBTU	2.71
Collar Contracts [Member] \| First Quarter 2022 [Member] [Member] \| Natural Gas Derivative Swaps [Member] \| Subsequent Event [Member]
Summary of Significant Accounting Policies
Oil and Gas Production Hedged Volumes \| MMBTU			3,150,000
Derivative, Average Floor Price \| $ / MMBTU			2.50
Derivative, Average Cap Price \| $ / MMBTU			3.26
Minimum [Member]
Summary of Significant Accounting Policies
Estimated useful lives of property	2 years
Maximum [Member]
Summary of Significant Accounting Policies
Estimated useful lives of property	20 years