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Note 20 - Summary of Quarterly Consolidated Financial Data (Unaudited) - Quarterly Financial Data (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
Interest income | $ 17,290,000 | $ 17,277,000 | $ 17,139,000 | $ 13,065,000 | $ 13,304,000 | $ 12,800,000 | $ 12,334,000 | $ 11,890,000 | $ 64,771,000 |  | $ 50,328,000 |
Interest expense | 2,999,000 | 3,000,000 | 2,934,000 | 1,350,000 | 1,312,000 | 1,241,000 | 1,079,000 | 993,000 | 10,283,000 |  | 4,625,000 |
Net interest income | 14,291,000 | 14,277,000 | 14,205,000 | 11,715,000 | 11,992,000 | 11,559,000 | 11,255,000 | 10,897,000 | 54,488,000 |  | 45,703,000 |
(Credit) provision for loan losses | 652,000 | 1,158,000 | (4,000) | (957,000) | 252,000 | 60,000 | (20,000) | 292,000 | 849,000 |  | 584,000 |
Net interest income after (credit) provision for loan losses | 13,639,000 | 13,119,000 | 14,209,000 | 12,672,000 | 11,740,000 | 11,499,000 | 11,275,000 | 10,605,000 | 53,639,000 |  | 45,119,000 |
Other income | 5,066,000 | 4,963,000 | 4,849,000 | 4,406,000 | 5,040,000 | 4,462,000 | 4,689,000 | 4,406,000 | 19,284,000 |  | 18,597,000 |
Net gains on available-for-sale debt securities | 3,000 | 13,000 | 7,000 | 0 | (4,000) | (2,000) | (282,000) | 0 | 23,000 |  | (288,000) |
Merger-related expenses | 281,000 | 206,000 | 3,301,000 | 311,000 | 128,000 | 200,000 | 0 | 0 | 4,099,000 |  | 328,000 |
Other expenses | 11,834,000 | 11,486,000 | 11,422,000 | 10,696,000 | 9,946,000 | 9,633,000 | 9,684,000 | 9,895,000 |  |  |  |
Income before equity in (excess distributions)/undistributed income of subsidiaries | 6,593,000 | 6,403,000 | 4,342,000 | 6,071,000 | 6,702,000 | 6,697,000 | 7,748,000 | 5,116,000 | 23,409,000 |  | 26,263,000 |
Income tax provision | 1,135,000 | 1,096,000 | 693,000 | 981,000 | 1,021,000 | 1,111,000 | 1,377,000 | 741,000 | 3,905,000 |  | 4,250,000 |
NET INCOME | 5,458,000 | 5,307,000 | 3,649,000 | 5,090,000 | 5,681,000 | 5,586,000 | 6,371,000 | 4,375,000 | 19,504,000 |  | 22,013,000 |
Net income attributable to common shares | $ 5,431,000 | $ 5,281,000 | $ 3,630,000 | $ 5,063,000 | $ 5,654,000 | $ 5,558,000 | $ 6,339,000 | $ 4,352,000 | $ 19,404,000 |  | $ 21,903,000 |
Net income per share – basic (in dollars per share) | $ 0.40 | $ 0.39 | $ 0.27 | $ 0.41 | $ 0.46 | $ 0.45 | $ 0.52 | $ 0.36 | $ 1.46 | [1] | $ 1.79 | [1]
Net income per share – diluted (in dollars per share) | $ 0.40 | $ 0.39 | $ 0.27 | $ 0.41 | $ 0.46 | $ 0.45 | $ 0.52 | $ 0.36 | $ 1.46 | [1] | $ 1.79 | [1]
Gain on restricted equity security |  |  |  |  | $ 0 | $ 571,000 | $ 1,750,000 | $ 0 | $ 0 |  | $ 2,321,000 |
[1] | Basic and diluted earnings per share under the two-class method are determined on net income reported on the income statement less earnings allocated to nonvested restricted shares with nonforfeitable dividends (participating securities).

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