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Note 23 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Statement of Cash Flows (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
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
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
Adjustments to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | 2,931,000 | 2,410,000 | 1,981,000
Stock grants to directors for retainer fees |  |  |  |  |  |  |  |  | 375,000 | 441,000 | 363,000
Other assets |  |  |  |  |  |  |  |  | (7,636,000) | (2,193,000) | (354,000)
Change in other liabilities |  |  |  |  |  |  |  |  | (2,818,000) | 11,029,000 | (943,000)
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Net cash for investing activities |  |  |  |  |  |  |  |  | (92,838,000) | (210,480,000) | (191,472,000)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock option exercises, net of cashless exercises |  |  |  |  |  |  |  |  | 128,000 | 108,000 | 318,000
Employee stock purchase plan |  |  |  |  |  |  |  |  | 50,000 | 52,000 | 46,000
Dividend reinvestment plan |  |  |  |  |  |  |  |  | 729,000 | 1,165,000 | 1,576,000
Repurchases of common stock |  |  |  |  |  |  |  |  | (7,183,000) | (5,943,000) | 0
Payment of cash dividends to common shareholders |  |  |  |  |  |  |  |  | (17,108,000) | (27,500,000) | (12,046,000)
Net cash for financing activities |  |  |  |  |  |  |  |  | 206,448,000 | 23,996,000 | 169,312,000
Net change in cash and cash equivalents |  |  |  |  |  |  |  |  | 158,377,000 | (124,747,000) | 16,505,000
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 49,456,000 | 42,024,000 | 31,274,000
Adjustments to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed net income of subsidiary |  |  |  |  |  |  |  |  | (33,449,000) | (14,005,000) | (17,158,000)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 2,931,000 | 2,410,000 | 1,981,000
Stock grants to directors for retainer fees |  |  |  |  |  |  |  |  | 375,000 | 441,000 | 363,000
Other assets |  |  |  |  |  |  |  |  | 2,387,000 | 1,384,000 | (230,000)
Change in other liabilities |  |  |  |  |  |  |  |  | (1,924,000) | (187,000) | (677,000)
Net cash from operating activities |  |  |  |  |  |  |  |  | 19,776,000 | 32,067,000 | 15,553,000
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Net capital investment into subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net cash for investing activities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock option exercises, net of cashless exercises |  |  |  |  |  |  |  |  | 128,000 | 108,000 | 318,000
Employee stock purchase plan |  |  |  |  |  |  |  |  | 50,000 | 52,000 | 46,000
Dividend reinvestment plan |  |  |  |  |  |  |  |  | 729,000 | 1,165,000 | 1,576,000
Repurchases of common stock |  |  |  |  |  |  |  |  | (7,183,000) | (5,943,000) | 0
Payment of cash dividends to common shareholders |  |  |  |  |  |  |  |  | (17,108,000) | (27,500,000) | (12,046,000)
Net cash for financing activities |  |  |  |  |  |  |  |  | (23,384,000) | (32,118,000) | (10,106,000)
Net change in cash and cash equivalents |  |  |  |  |  |  |  |  | (3,608,000) | (51,000) | 5,447,000
Cash and cash equivalents at beginning of period |  |  |  | $ 9,653,000 |  |  |  | $ 9,704,000 | 9,653,000 | 9,704,000 | 4,257,000
Cash and cash equivalents at end of period | $ 6,045,000 |  |  |  | $ 9,653,000 |  |  |  | $ 6,045,000 | $ 9,653,000 | $ 9,704,000

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