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Note 5 - Stock-Based Compensation (Details) - Restricted Stock Units (Restricted Stock Units (RSUs) [Member]) | 3 Months Ended
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Mar. 31, 2014
Restricted Stock Units (RSUs) [Member] |
Note 5 - Stock-Based Compensation (Details) - Restricted Stock Units [Line Items] |
Balance at December 31, 2013 | 143,433
Balance at March 31, 2014 | 148,245
Granted | 4,812

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- Definition Grant shares during period restricted stock unit award. + References No definition available. + Details
Name: | caty_GrantSharesDuringPeriodRestrictedStockUnitAward
Namespace Prefix: | caty_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | caty_Note5StockBasedCompensationDetailsRestrictedStockUnitsLineItems
Namespace Prefix: | caty_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | caty_RestrictedStockAwardBeginningOutstandingShares
Namespace Prefix: | caty_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Restricted stock unit award ending outstanding shares. + References No definition available. + Details
Name: | caty_RestrictedStockUnitAwardEndingOutstandingShares
Namespace Prefix: | caty_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant