Alternative Minimum Tax Receivable

No definition available.

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- Definition

Enhanced oil recovery credits to carryforward

+ References

No definition available.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from in-process research and development costs.

+ References

No definition available.

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- Definition

Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible interest carryforward.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

+ References

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Income Taxes (Details Textuals) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation Allowance [Line Items]
Loss and tax credit carryforwards - state	$ 52,917,000	$ 52,366,000
Valuation allowance	77,215,000	51,093,000	$ 51,134,000	$ 36,510,000
Federal net operating loss carryforwards	0
Business interest expense carryforward	24,513,000	$ 9,049,000
Enhanced oil recovery credit carryforwards	49,900,000
Research and development credits	21,600,000
Alternative minimum tax credits	6,000,000.0
Unrecognized Tax Benefits	5,400,000
Business interest expense
Valuation Allowance [Line Items]
Valuation allowance	24,500,000
State of Louisiana, Mississippi and Alabama
Valuation Allowance [Line Items]
Valuation allowance	52,700,000
State of Louisiana
Valuation Allowance [Line Items]
Valuation allowance	41,300,000
State of Mississippi
Valuation Allowance [Line Items]
Valuation allowance	10,600,000
State of Alabama
Valuation Allowance [Line Items]
Valuation allowance	$ 800,000