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Note 14 - Asset Retirement Obligation (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Asset Retirement Obligations [Table Text Block] |
|  | 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 Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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