Capitalized costs oil and gas producing activities, total.

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Discount rate for estimated future net revenues from proved properties.

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Percentage of working interest interest in wells.

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Supervision fees.

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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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Amount of allowance for credit loss on accounts receivable, classified as current.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

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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 of lessee's right to use underlying asset under operating lease.

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

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Summary of Significant Accounting Policies (Textual) [Abstract]
Total capitalized internal costs	$ 5,300	$ 4,500
Discount rate for estimated future net revenues from proved properties	10.00%
Write-down of oil and gas properties	$ 0	0
Revenue from Contract with Customer, Excluding Assessed Tax	288,631	257,286
Allowance for doubtful accounts receivable, current	100	100
Accounts receivable from oil and gas sales	24,600	36,900
Accounts receivable related to joint interest owners	3,700	5,600
Severance tax credit receivables	5,400	2,400
Other receivables	$ 3,300	1,600
Percentage of working interest in wells	100.00%
Total amount of supervision fees charged to wells	$ 4,900	4,600
Income Tax Expense (Benefit)	(21,582)	928
Current State and Local Tax Expense (Benefit)	$ 1,100	$ 1,066
Concentration risk, percentage		10.00%
Treasury Stock, Shares, Acquired	22,482	15,107
Operating Lease, Right-of-Use Asset	$ 9,374	$ 0	$ 2,200
Kinder Morgan Concentration Risk [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Concentration risk, percentage	31.00%	37.00%
Plains Marketing Concentration Risk [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Concentration risk, percentage	14.00%
Twin Eagle Concentration Risk [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Concentration risk, percentage	13.00%
Shell Trading Concentration Risk [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Concentration risk, percentage	11.00%
Minimum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Property, Plant and Equipment, Useful Life	2 years
Maximum [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Property, Plant and Equipment, Useful Life	20 years
Oil sales [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 92,833	$ 45,375
Natural gas sales [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	170,472	183,288
NGL sales [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	25,241	28,639
Other sales [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 86	$ (16)