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Note 2 - Business Combination (Details Textual) - First of Long Island Corporation [Member] $ / shares in Units, $ in Millions | Sep. 04, 2024 USD ($) $ / shares
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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | $ 14,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans | 11,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | $ 11,000
Business Acquisition, Equity Interest Issued or Issuable, Share Exchange Ratio | 0.5175
Business Combination, Consideration Transferred | $ 288
Share Price (in dollars per share) | $ / shares | $ 24.31

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