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Note 20 - Condensed Financial Information of Cathay General Bancorp - Balance Sheets (Details) (Parentheticals) - $ / shares
Dec. 31, 2024
Dec. 31, 2023
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 91,615,458 91,392,480
Common stock, shares outstanding (in shares) 70,863,324 72,668,927
Treasury stock, shares (in shares) 20,752,134 18,723,553
Parent Company [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 91,615,458 91,392,480
Common stock, shares outstanding (in shares) 70,863,324 72,688,927
Treasury stock, shares (in shares) 20,752,134 18,723,553