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Note 1 - Summary of Significant Accounting Policies (Details Textual) shares in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 08, 2018 | Sep. 15, 2015 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
Number of Financial Centers |  |  |  | 200 |  |
Number of Reportable Segments |  |  |  | 1 |  |
FDIC Indemnification Asset, Cash Payments Received |  | $ 2,368,000 | $ 2,368,000 |  |  |
Gain (Loss) on Contract Termination |  | $ (7,476,000) | $ (7,476,000) |  |  | $ (7,476,000)
Derivative Asset, Notional Amount |  |  |  | $ 303,500,000 | $ 99,200,000 |
Employee Stock Option [Member] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  |  |  | 0 | 0 | 0
Subsequent Event [Member] |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 2 |  |  |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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