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Note 12 - Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Schedule of Quarterly Financial Information [Table Text Block] |
|  | Fiscal Quarter |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
|  | (In thousands, except for per share data) |
Year Ended December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ | 80,674 |  |  | $ | 94,691 |  |  | $ | 102,879 |  |  | $ | 126,587 |
Operating income |  |  | 20,821 |  |  |  | 33,046 |  |  |  | 41,063 |  |  |  | 58,511 |
Net income (loss) |  |  | 3,371 |  |  |  | 10,994 |  |  |  | 15,873 |  |  |  | (2,109 | )
Net income (loss) available to common stockholders |  |  | 2,192 |  |  |  | 9,815 |  |  |  | 14,640 |  |  |  | (2,613 | )
Basic net income (loss) available to common stockholders per share |  | $ | 0.04 |  |  | $ | 0.17 |  |  | $ | 0.26 |  |  | $ | (0.05 | )
Diluted net income (loss) available to common stockholders per share |  | $ | 0.04 |  |  | $ | 0.17 |  |  | $ | 0.26 |  |  | $ | (0.05 | )
Year Ended December 31, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ | 69,742 |  |  | $ | 76,201 |  |  | $ | 76,518 |  |  | $ | 84,670 |
Operating income |  |  | 11,506 |  |  |  | 19,028 |  |  |  | 18,222 |  |  |  | 26,592 |
Net income (loss) |  |  | (3,083 | ) |  |  | 2,559 |  |  |  | 1,984 |  |  |  | 7,575 |
Net income (loss) available to common stockholders |  |  | (4,872 | ) |  |  | 771 |  |  |  | 27 |  |  |  | 5,869 |
Basic net (loss) income available to common stockholders per share |  | $ | (0.09 | ) |  | $ | 0.01 |  |  | $ | - |  |  | $ | 0.10 |
Diluted net (loss) income available to common stockholders per share |  | $ | (0.09 | ) |  | $ | 0.01 |  |  | $ | - |  |  | $ | 0.10 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration