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Note 21 - Financial Information of Colony Bankcorp, Inc. (Parent Only) - Balance Sheets, Parent Only (Details) (Parentheticals) - $ / shares | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Preferred stock, stated value (in dollars per share) | $ 1,000 | $ 1,000
Preferred stock, shares authorized (in shares) | 10,000,000 | 10,000,000
Preferred stock, shares issued (in shares) | 0 | 9,360
Preferred stock, shares outstanding (in shares) | 0 | 9,360
Common stock, par value (in dollars per share) | $ 1 | $ 1
Common stock, shares authorized (in shares) | 20,000,000 | 20,000,000
Common stock, shares issued (in shares) | 8,439,258 | 8,439,258
Common stock, shares outstanding (in shares) | 8,439,258 | 8,439,258
Parent Company [Member] |  |
Preferred stock, stated value (in dollars per share) | $ 1,000 | $ 1,000
Preferred stock, shares authorized (in shares) | 10,000,000 | 10,000,000
Preferred stock, shares issued (in shares) | 0 | 9,360
Preferred stock, shares outstanding (in shares) | 0 | 9,360
Common stock, par value (in dollars per share) | $ 1 | $ 1
Common stock, shares authorized (in shares) | 20,000,000 | 20,000,000
Common stock, shares issued (in shares) | 8,439,258 | 8,439,258
Common stock, shares outstanding (in shares) | 8,439,258 | 8,439,258

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