MIDDLEFIELD, Ohio, Oct. 22, 2025 (GLOBE NEWSWIRE) -- Middlefield Banc Corp. (NASDAQ: MBCN) today reported financial results for the nine months ended September 30, 2025. 2025 Third-Quarter Financial Highlights (on a year-over-year basis):  ●Third quarter diluted earnings increased to $0.65 per share, driving year-to-date earnings of$2.01 per share ●Pre-tax, pre-provision earnings(1) increased 37.3% to $6.8 million ●Net interest margin expanded 33 basis points to 3.79$102.5 million ...