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Note 11 - Capital Stock (Details Textual) - USD ($)
 10 Months Ended 12 Months Ended
Feb. 27, 2015
Dec. 31, 2016
Feb. 18, 2016
Dec. 31, 2013
Dec. 31, 2015
Mar. 04, 2014
Jul. 23, 2012
Feb. 27, 2009
Preferred Stock, Shares Authorized         40,040,000     40,040,000
Preferred Stock, Par or Stated Value Per Share         $ 0.01     $ 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%  
Stock Repurchased During Period, Shares       419,564        
Stock Repurchased Weighted Average Price       $ 25.89        
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased       154,136        
Shelf Registration Statement Max Capital Allowed to Raise           $ 300,000,000    
Community First Bancshares Inc [Member]                
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 6,552,915              
Community First Bancshares Inc [Member] | Preferred Stock [Member]                
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 30,852              
Maximum [Member]                
Preferred Stock, Liquidation Preference, Value               $ 80,000,000