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Note 24 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Statements of Income (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income |  |  |  |  |  |  |  |  |  |  |
Interest and dividends from subsidiaries | $ 29,715,000,000 | $ 29,706,000,000 | $ 30,147,000,000 | $ 28,889,000,000 | $ 28,575,000,000 | $ 28,501,000,000 | $ 27,663,000,000 | $ 27,589,000,000 | $ 118,457,000 | $ 112,328,000 | $ 89,118,000
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 12,590,000 | 11,154,000 | 11,340,000
Income before federal income tax expense |  |  |  |  |  |  |  |  | 46,887,000 | 38,831,000 | 25,196,000
Federal income tax expense |  |  |  |  |  |  |  |  | 14,974,000 | 11,811,000 | 7,865,000
Net income |  |  |  |  |  |  |  |  | 31,913,000 | 27,020,000 | 17,331,000
Comprehensive income |  |  |  |  |  |  |  |  | 25,069,000 | 28,267,000 | 22,920,000
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Income |  |  |  |  |  |  |  |  |  |  |
Interest and dividends from subsidiaries |  |  |  |  |  |  |  |  | 32,521,000 | 24,166,000 | 12,139,000
Total income |  |  |  |  |  |  |  |  | 32,521,000 | 24,166,000 | 12,139,000
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 2,490,000 | 2,569,000 | 2,145,000
Other operating expenses |  |  |  |  |  |  |  |  | 2,953,000 | 2,276,000 | 3,552,000
Total expenses |  |  |  |  |  |  |  |  | 5,443,000 | 4,845,000 | 5,697,000
Income before federal income tax expense |  |  |  |  |  |  |  |  | 27,078,000 | 19,321,000 | 6,442,000
Federal income tax expense |  |  |  |  |  |  |  |  | (836,000) | (2,051,000) | (1,758,000)
Equity in undistributed net income of subsidiary |  |  |  |  |  |  |  |  | 3,999,000 | 5,648,000 | 9,131,000
Net income |  |  |  |  |  |  |  |  | 31,913,000 | 27,020,000 | 17,331,000
Comprehensive income |  |  |  |  |  |  |  |  | $ 25,069,000 | $ 28,267,000 | $ 22,920,000

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