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Note 7 - East Tennessee Materials and Energy Corporation ("M&EC") (Tables) | 6 Months Ended
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Jun. 30, 2017
Notes Tables |
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
Amounts in thousands |  |  |  |
Balance as of December 31, 2016 |  |  | 3,058 |
Accretion expense |  |  | 94 |
Payments |  |  | (407 | )
Balance as of June 30, 2017 |  | $ | 2,745 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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