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Note 12 - Capital Stock (Details Textual) |  |  | 10 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 08, 2018 | Feb. 27, 2015 shares | Dec. 31, 2016 | Feb. 18, 2016 | Jul. 23, 2012 shares | Feb. 27, 2009 USD ($) $ / shares shares
Preferred Stock, Shares Authorized |  |  |  |  |  | 40,040,000
Preferred Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  | $ 0.01
Preferred Stock, Dividend Rate, Percentage |  |  | 9.00% | 1.00% |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  | 850,000 |
Percent of Oustanding Stock |  |  |  |  | 5.00% |
Community First Bancshares Inc [Member] |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares |  | 13,105,830 |  |  |  |
Community First Bancshares Inc [Member] | Preferred Stock [Member] |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares |  | 30,852 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 2 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value | $ |  |  |  |  |  | $ 80,000,000

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