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Note 23 - Financial Information of Colony Bankcorp, Inc. (Parent Only) - Consolidated Statements of Comprehensive Income (Loss), Parent Company (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Income | $ 11,917,400 | $ 7,750,978 | $ 8,673,210
Gains (Losses) on Securities Arising During the Year | (2,033,636) | (608,355) | (505,367)
Tax Effect | (427,063) | (206,841) | (171,825)
Change in Unrealized Gain (Loss) on AFS Investment Securities | (2,149,545) | (608,355) | (890,590)
Change in Unrealized Gains (Losses) on Securities Available for Sale, Net of Reclassification Adjustment and Tax Effects | (1,698,141) | (401,514) | (587,789)
Comprehensive Income | 10,219,259 | 7,349,464 | 8,085,421
Parent Company [Member] |  |  |
Net Income | 11,917,400 | 7,750,978 | 8,673,210
Gains (Losses) on Securities Arising During the Year | (2,033,636) | (608,355) | (505,367)
Tax Effect | 427,063 | 206,841 | 171,825
Change in Unrealized Gain (Loss) on AFS Investment Securities | (115,909) |  | (385,223)
Tax Effect | 24,341 |  | 130,976
Change in Unrealized Gains (Losses) on Securities Available for Sale, Net of Reclassification Adjustment and Tax Effects | (1,698,141) | (401,514) | (587,789)
Comprehensive Income | $ 10,219,259 | $ 7,349,464 | $ 8,085,421

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