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Note 2 - Business Combination (Details) - Purchase Price (Firstbank Corporation [Member], USD $) | 0 Months Ended | 1 Months Ended
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Jun. 01, 2014 | Jun. 30, 2014
Firstbank Corporation [Member] |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Mercantile common shares issued for Firstbank common shares (in Shares) | 8,087,272 | 8,087,272
Price per share, based on Mercantile closing price on May 30, 2014 (in Dollars per share) |  | $ 21.43
Value of common stock issued |  | $ 173,310,000
Replacement stock options |  | 1,664,000
Total purchase price |  | $ 174,974,000

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