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Note 22 - Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Unaudited) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Interest income | $ 39,564,000 | $ 40,316,000 | $ 39,820,000 | $ 38,637,000 | $ 37,195,000 | $ 35,486,000 | $ 34,319,000 | $ 34,981,000 | $ 158,337,000 | $ 141,981,000 | $ 125,543,000
Net interest income | 31,168,000 | 31,605,000 | 31,116,000 | 30,645,000 | 30,818,000 | 29,840,000 | 29,225,000 | 30,199,000 | 124,534,000 | 120,082,000 | 109,748,000
Net income | $ 13,317,000 | $ 12,600,000 | $ 11,715,000 | $ 11,824,000 | $ 11,574,000 | $ 10,123,000 | $ 9,446,000 | $ 10,881,000 | $ 49,456,000 | $ 42,024,000 | $ 31,274,000
Earnings per share basic (in dollars per share) | $ 0.81 | $ 0.77 | $ 0.71 | $ 0.72 | $ 0.70 | $ 0.61 | $ 0.57 | $ 0.66 | $ 3.01 | $ 2.53 | $ 1.90
Earnings per share diluted (in dollars per share) | $ 0.81 | $ 0.77 | $ 0.71 | $ 0.72 | $ 0.70 | $ 0.61 | $ 0.57 | $ 0.66 | $ 3.01 | $ 2.53 | $ 1.90

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