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Note 11 - Accrued Closure Costs and ARO (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
Amounts in thousands |  |  |  |
Balance as of December 31, 2013 |  | $ | 5,222 |
Accretion expense |  |  | 286 |
Balance as of December 31, 2014 |  |  | 5,508 |
Accretion expense |  |  | 299 |
Payments |  |  | (331 | )
Adjustment to closure liability |  |  | (175 | )
Balance as of December 31, 2015 |  | $ | 5,301 |
Schedule of Asset Retirement Obligations [Table Text Block] |
Amounts in thousands |  |  |  |
Balance as of December 31, 2013 |  | $ | 2,961 |
Amortization of closure and post-closure asset |  |  | (91 | )
Balance as of December 31, 2014 |  |  | 2,870 |
Amortization of closure and post-closure asset |  |  | (152 | )
Adjustment to closure and post-closure asset |  |  | (143 | )
Balance as of December 31, 2015 |  | $ | 2,575 |

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