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Note 8 - Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | For the three months ended June 30, |  |  | For the six months ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Net income available to common stockholders |  | $ | 18,156 |  |  | $ | 8,473 |  |  | $ | 32,206 |  |  | $ | 15,586 |
Weighted average number of common shares outstanding |  |  | 43,334,441 |  |  |  | 41,319,057 |  |  |  | 43,132,398 |  |  |  | 41,316,958 |
Effect of stock options |  |  | 27,114 |  |  |  | 143,537 |  |  |  | 24,429 |  |  |  | 160,906 |
Weighted average diluted number of common shares outstanding |  |  | 43,361,555 |  |  |  | 41,462,594 |  |  |  | 43,156,827 |  |  |  | 41,477,864 |
Basic earnings per share |  | $ | 0.42 |  |  | $ | 0.21 |  |  | $ | 0.75 |  |  | $ | 0.38 |
Diluted earnings per share |  | $ | 0.42 |  |  | $ | 0.20 |  |  | $ | 0.75 |  |  | $ | 0.38 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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