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Note 9 - Acquisitions (Details Textual) | Apr. 18, 2018 USD ($) $ / shares | Mar. 20, 2018 USD ($) shares | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($)
--- | --- | --- | --- | --- | ---
Assets, Total |  |  | $ 4,026,314,414 | $ 3,982,664,773 | $ 3,381,012,618
Deposits, Total |  |  | 3,280,001,492 | $ 3,266,655,056 |
Springfield Bancshares [Member] |  |  |  |  |
Assets, Total |  |  | 563,200,000 |  |
Deposits, Total |  |  | $ 446,500,000 |  |
Bates Companies [Member] |  |  |  |  |
Assets under Management, Carrying Amount |  | $ 700,000,000 |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |  |  |
Payments to Acquire Businesses, Gross |  | $ 3,000,000 |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  | $ 3,000,000 |  |  |
Stock Issued During Period, Shares, Acquisitions | shares |  | 21,528 |  |  |
Stock Issued During Period, Value, Acquisitions |  | $ 1,000,000 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares |  | 64,583 |  |  |
Springfield Bancshares [Member] | Subsequent Event [Member] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00% |  |  |  |
Business Acquisition, Shares Exchanged, Per Share Amount | 0.306 |  |  |  |
Business Acquisition, Shares Exchanged, Per Share Value | $ / shares | $ 1.50 |  |  |  |
Business Combination, Consideration Transferred, Total | $ 86,700,000 |  |  |  |

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