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Note 4 - Earnings per Share | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Text Block] | 4. Earnings per Share Basic earnings per share exclude dilution and is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock and resulted in the issuance of common stock that then shared in earnings. Potential dilution is excluded from computation of diluted per-share amounts when a net loss from operations exists. Outstanding stock options with anti-dilutive effect were not included in the computation of diluted earnings per share. The following table sets forth earnings per common share calculations:
|  | Three months ended March 31, |
(Dollars in thousands, except share and per share data) |  | 2013 |  |  | 2012 |
Net income attributable to Cathay General Bancorp |  | $ | 28,847 |  |  | $ | 28,913 |
Dividends on preferred stock and noncash charge from repayment |  |  | (5,184 | ) |  |  | (4,117 | )
Net income available to common stockholders |  | $ | 23,663 |  |  | $ | 24,796 |
Weighted-average shares: |  |  |  |  |  |  |  |
Basic weighted-average number of common shares outstanding |  |  | 78,795,564 |  |  |  | 78,678,645 |
Dilutive effect of weighted-average outstanding common share equivalents |  |  |  |  |  |  |  |
Stock options |  |  | 19,577 |  |  |  | 11,487 |
Diluted weighted-average number of common shares outstanding |  |  | 78,815,141 |  |  |  | 78,690,132 |
Average stock options and warrants with anti-dilutive effect |  |  | 5,630,813 |  |  |  | 6,227,224 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.30 |  |  | $ | 0.32 |
Diluted |  | $ | 0.30 |  |  | $ | 0.32 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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