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Note 4 - Earnings per Share (Tables) | 3 Months Ended
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Mar. 31, 2014
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three months ended March 31, |
(Dollars in thousands, except share and per share data) |  | 2014 |  |  | 2013 |
Net income attributable to Cathay General Bancorp |  | $ | 31,259 |  |  | $ | 28,847 |
Dividends on preferred stock and noncash charge from repayment |  |  | - |  |  |  | (5,184 | )
Net income available to common stockholders |  | $ | 31,259 |  |  | $ | 23,663 |
Weighted-average shares: |  |  |  |  |  |  |  |
Basic weighted-average number of common shares outstanding |  |  | 79,595,757 |  |  |  | 78,795,564 |
Dilutive effect of weighted-average outstanding common share equivalents |  |  |  |  |  |  |  |
Warrants |  |  | 298,535 |  |  |  | - |
Options |  |  | 101,698 |  |  |  | - |
Restricted stock units |  |  | 43,392 |  |  |  | 19,577 |
Diluted weighted-average number of common shares outstanding |  |  | 80,039,382 |  |  |  | 78,815,141 |
Average stock options and warrants with anti-dilutive effect |  |  | 1,985,848 |  |  |  | 5,630,813 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.39 |  |  | $ | 0.30 |
Diluted |  | $ | 0.39 |  |  | $ | 0.30 |

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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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