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Note 6 - Goodwill and Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Goodwill [Table Text Block] |
|  | 2017 |  |  | 2016 |
Balance at the beginning of period |  | $ | 13,110,913 |  |  | $ | 3,222,688 |
Goodwill from acquisition of Guaranty Bank |  |  | 15,223,179 |  |  |  | - |
Goodwill from acquisition of CSB |  |  | - |  |  |  | 9,888,225 |
Balance at the end of period |  | $ | 28,334,092 |  |  | $ | 13,110,913 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | 2017 |  |  | 2016 |
Balance at the beginning of the period |  | $ | 7,381,213 |  |  | $ | 1,471,410 |
Core deposit intangible from acquisition of Guaranty Bank |  |  | 2,698,301 |  |  |  | - |
Core deposit intangible from acquisition of CSB |  |  | - |  |  |  | 6,352,653 |
Amortization expense |  |  | (1,000,561 | ) |  |  | (442,850 | )
Balance at the end of the period |  | $ | 9,078,953 |  |  | $ | 7,381,213 |
Gross carrying amount |  | $ | 11,046,081 |  |  | $ | 8,347,780 |
Accumulated amortization |  |  | (1,967,128 | ) |  |  | (966,567 | )
Net book value |  | $ | 9,078,953 |  |  | $ | 7,381,213 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Years ending December 31, |  | Amount |
2018 |  | $ | 1,218,202 |
2019 |  |  | 1,196,331 |
2020 |  |  | 1,169,934 |
2021 |  |  | 1,139,012 |
2022 |  |  | 1,103,565 |
Thereafter |  |  | 3,251,909 |
|  | $ | 9,078,953 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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