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Note 4 - Earnings per Share (Details) - Earnings per Share (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Note 4 - Earnings per Share (Details) - Earnings per Share [Line Items] |  |  |  |
Net income attributable to Cathay General Bancorp (in Dollars) | $ 35,909 | $ 32,478 | $ 102,252 | $ 91,241
Dividends on preferred stock and noncash charge from repayment (in Dollars) |  | (2,434) |  | (9,685)
Net income available to common stockholders (in Dollars) | $ 35,909 | $ 30,044 | $ 102,252 | $ 81,556
Basic weighted-average number of common shares outstanding | 79,677,952 | 78,894,262 | 79,639,202 | 78,853,333
Dilutive effect of weighted-average outstanding common share equivalents |  |  |  |
Diluted weighted-average number of common shares outstanding | 80,176,100 | 79,114,122 | 80,087,819 | 78,944,152
Average stock options and warrants with anti-dilutive effect | 1,990,358 | 3,668,285 | 1,993,384 | 4,958,218
Basic (in Dollars per share) | $ 0.45 | $ 0.38 | $ 1.28 | $ 1.03
Diluted (in Dollars per share) | $ 0.45 | $ 0.38 | $ 1.28 | $ 1.03
Warrant [Member] |  |  |  |
Dilutive effect of weighted-average outstanding common share equivalents |  |  |  |
Dilutive effect of weighted-average number of common shares outstanding | 346,101 | 171,426 | 306,306 | 57,771
Equity Option [Member] |  |  |  |
Dilutive effect of weighted-average outstanding common share equivalents |  |  |  |
Dilutive effect of weighted-average number of common shares outstanding | 109,803 |  | 103,022 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Dilutive effect of weighted-average outstanding common share equivalents |  |  |  |
Dilutive effect of weighted-average number of common shares outstanding | 42,244 | 48,434 | 39,289 | 33,048

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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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