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Note 24 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Details) - Condensed Statement of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operating activities |  |  |
Net income | $ 27,020,000 | $ 17,331,000 | $ 17,033,000
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Stock-based compensation expense | 684,000 | 714,000 | 473,000
Stock grants to directors for retainer fees | 403,000 | 155,000 | 0
Change in other assets | (4,815,000) | 1,795,000 | 8,465,000
Cash flows from financing activities |  |  |
Stock option exercises, net of cashless exercises | 891,000 | 282,000 | 289,000
Employee stock purchase plan | 44,000 | 23,000 | 19,000
Dividend reinvestment plan | 655,000 | 209,000 | 33,000
Repurchase of common shares | (15,762,000) | 0 | 0
Cash dividends on common stock | (9,516,000) | (24,464,000) | (3,889,000)
Net change in cash and cash equivalents | (82,847,000) | 25,773,000 | 10,962,000
Parent Company [Member] |  |  |
Cash flows from operating activities |  |  |
Net income | 27,020,000 | 17,331,000 | 17,033,000
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Equity in undistributed net income of subsidiary | (5,648,000) | (9,131,000) | (14,461,000)
Stock-based compensation expense | 684,000 | 714,000 | 473,000
Stock grants to directors for retainer fees | 403,000 | 155,000 | 0
Change in other assets | 11,000 | (8,163,000) | 3,244,000
Change in other liabilities | 4,717,000 | 21,979,000 | (708,000)
Net cash from operating activities | 27,187,000 | 22,885,000 | 5,581,000
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 |  |  |
Stock option exercises, net of cashless exercises | 891,000 | 282,000 | 289,000
Employee stock purchase plan | 44,000 | 23,000 | 19,000
Dividend reinvestment plan | 655,000 | 209,000 | 33,000
Repurchase of common shares | (15,762,000) | 0 | 0
Cash dividends on common stock | (9,516,000) | (24,464,000) | (3,889,000)
Net cash for financing activities | (23,688,000) | (23,950,000) | (3,548,000)
Net change in cash and cash equivalents | 3,499,000 | (1,065,000) | 2,033,000
Cash and cash equivalents at beginning of period | 1,441,000 | 2,506,000 | 473,000
Cash and cash equivalents at end of period | $ 4,940,000 | $ 1,441,000 | $ 2,506,000

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