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Note 21 - Financial Information of Colony Bankcorp, Inc. (Parent Only) (Details) - Balance Sheets, Parent Company (Parentheticals) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]    
Preferred Stock, Stated Value (in Dollars per share) $ 1,000 $ 1,000
Preferred Stock, Shares Authorized 10,000,000 10,000,000
Preferred Stock, Shares Issued 18,021 28,000
Common Stock, Par Value (in Dollars per share) $ 1 $ 1
Common Stock, Shares Authorized 20,000,000 20,000,000
Common Stock, Shares Issued 8,439,258 8,439,258
Parent Company [Member]    
Condensed Balance Sheet Statements, Captions [Line Items]    
Preferred Stock, Stated Value (in Dollars per share) $ 1,000 $ 1,000
Preferred Stock, Shares Authorized 10,000,000 10,000,000
Preferred Stock, Shares Issued 18,021 28,000
Common Stock, Par Value (in Dollars per share) $ 1 $ 1
Common Stock, Shares Authorized 20,000,000 20,000,000
Common Stock, Shares Issued 8,439,258 8,439,258