Note 1 - Basis of Presentation (Details Textual) $ in Thousands |
9 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Apr. 15, 2020
USD ($)
|
Sep. 30, 2020
USD ($)
|
Dec. 31, 2019
USD ($)
|
|
| Proceeds from Paycheck Protection Program Under CARES Act | $ 8,400 | ||
| Increase (Decrease), Operating Lease Expense | $ (2,300) | ||
| Increase (Decrease), General and Administrative Expense | 4,200 | ||
| Increase (Decrease), Interest Expense, Net | 1,900 | ||
| Asset Retirement Obligation, Ending Balance | 381,735 | $ 355,594 | |
| Restricted Deposits for Asset Retirement Obligations [Member] | |||
| Escrow Deposit | 13,900 | ||
| Other Liabilities [Member] | |||
| Asset Retirement Obligation, Ending Balance | $ 11,100 | ||
| Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Three Major Oil and Gas Companies [Member] | |||
| Concentration Risk, Percentage | 56.00% | 63.00% | |
| Number of Major Customers | 3 | 3 |
| X | ||||||||||
- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The increase (decrease) during the period to general and administrative expense. No definition available.
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- Definition The increase (decrease) during the period to the net amount of operating interest expense. No definition available.
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- Definition The increase (decrease) during the period to the amount of operating lease expense. No definition available.
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- Definition Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc. No definition available.
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- Definition The cash inflow received from loan funding under the Paycheck Protection Program which was established under the Coronavirus Aid, Relief and Economic Security (CARES) Act in March 2020. No definition available.
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