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Note 14 - Asset Retirement Obligation | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Asset Retirement Obligation Disclosure [Text Block] | NOTE 14 — ASSET RETIREMENT OBLIGATION The following table presents a reconciliation of the beginning and ending aggregate carrying amount of asset retirement obligation for the years presented below:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |
|  | (Dollars in thousands) |
Balance at beginning of year |  | $ | 23,348 |  |  | $ | 20,856 |
Revision in estimated cash flows |  |  | 1,888 |  |  |  | 303 |
Liabilities incurred |  |  | — |  |  |  | 540 |
Accretion expense |  |  | 1,874 |  |  |  | 1,649 |
Balance at end of year |  | $ | 27,110 |  |  | $ | 23,348 |

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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