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Note 3 - Acquisition Activity (Details Textual) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Jan. 24, 2019 USD ($) $ / shares shares | Jan. 23, 2019 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ |  |  |  | $ 15,378
AJS Bancorp, Inc [Member] |  |  |  |
Business Acquisition, Number of Shares Given Per Share of Acquired Company, Stockholders Holding 100 Shares or More (in shares) | shares | 0.203 |  |  |
Business Acquisition, Cash Paid Per Share of Acquired Company, Stockholders Holding 100 or More Shares (in dollars per share) | $ / shares | $ 7.20 |  |  |
Business Acquisition, Cash Paid Per Share of Acquired Company, Holding Less Than 100 Shares (in dollars per share) | $ / shares | $ 16 |  |  |
Business Acquisition, Number of Shares Given Per Share of Acquired Company, Less Than 100 Shares (in shares) | shares | 0 |  |  |
Business Acquisition, Fractional Shares Multiplier (in dollars per share) | $ / shares | $ 43.01 |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares | 416,478 |  |  |
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ | $ 15,743 | $ 15,700 |  |
Business Combination, Consideration Transferred, Total | $ | $ 33,235 | 33,200 |  |
Business Acquisition, Transaction Costs | $ |  | $ 2,100 |  |
Number of Banking Centers |  | 22 |  |
AJS Bancorp, Inc [Member] | Maximum [Member] |  |  |  |
Business Acquisition, Number of Held Shares of Acquired Company (in shares) | shares | 100 |  |  |

X
- Definition The amount of cash paid per share of the acquired company held by shareholders' with less than 100 shares + References No definition available. + Details
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- Definition The amount of cash paid per share of the acquired company held by shareholders', if holding 100 shares or more. + References No definition available. + Details
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- Definition The number of shares given to each shareholder per share of the acquired company held, if holding 100 or more shares. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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