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Note 5 - Stock-Based Compensation (Details) - Tax Short-fall from Share-based Payment Arrangements (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Tax Short-fall from Share-based Payment Arrangements [Abstract] |  |
Short-fall of tax deductions in excess of grant-date fair value | $ (4,395)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | $ (1,227)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Benefit of tax deductions on grant-date fair value | 4,442 caty_BenefitOfTaxDeductionsOnGrantDateFairValue | 1,227 caty_BenefitOfTaxDeductionsOnGrantDateFairValue
Total benefit of tax deductions | $ 47 caty_TotalBenefitOfTaxDeductions |

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- Definition The benefit of tax deductions on grant date fair value. + References No definition available. + Details
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- Details
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- Definition The total benefit of tax deductions. + References No definition available. + Details
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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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