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Note 6 - Goodwill and Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Goodwill [Table Text Block] |
|  | 2018 |  | 2017 |  | 2016
Balance at the beginning of period |  | $ | 28,334,092 |  | $ | 13,110,913 |  | $ | 3,222,688
Goodwill from merger with Springfield Bancshares |  |  | 45,974,931 |  |  | — |  |  | —
Goodwill from acquisition of the Bates Companies |  |  | 3,766,074 |  |  | — |  |  | —
Goodwill from acquisition of Guaranty Bank |  |  | — |  |  | 15,223,179 |  |  | —
Goodwill from acquisition of Guaranty Bank - measurement period adjustment |  |  | (243,195) |  |  | — |  |  | —
Goodwill from acquisition of CSB |  |  | — |  |  | — |  |  | 9,888,225
Balance at the end of period |  | $ | 77,831,902 |  | $ | 28,334,092 |  | $ | 13,110,913
Core Deposits [Member] |
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | 2018 |  | 2017 |  | 2016
Balance at the beginning of the period |  | $ | 9,078,953 |  | $ | 7,381,213 |  | $ | 1,471,409
Core deposit intangible from merger with Springfield Bancshares |  |  | 8,208,728 |  |  | — |  |  | —
Core deposit intangible from acquisition of Guaranty Bank |  |  | — |  |  | 2,698,301 |  |  | —
Core deposit intangible from acquisition of CSB |  |  | — |  |  | — |  |  | 6,352,653
Amortization expense |  |  | (1,692,431) |  |  | (1,000,561) |  |  | (442,849)
Balance at the end of the period |  | $ | 15,595,250 |  | $ | 9,078,953 |  | $ | 7,381,213
Gross carrying amount |  | $ | 19,254,809 |  | $ | 11,046,081 |  | $ | 8,347,780
Accumulated amortization |  |  | (3,659,559) |  |  | (1,967,128) |  |  | (966,567)
Net book value |  | $ | 15,595,250 |  | $ | 9,078,953 |  | $ | 7,381,213
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Years ending December 31, |  | Amount
2019 |  | $ | 2,129,141
2020 |  |  | 2,084,985
2021 |  |  | 2,032,204
2022 |  |  | 1,970,792
2023 |  |  | 1,776,065
Thereafter |  |  | 5,602,063
|  | $ | 15,595,250
Customer Lists [Member] |
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | 2018
Balance at the beginning of period |  | $ | —
Customer list intangible from acquisition of Bates Companies |  |  | 1,854,932
Balance at the end of period |  |  | 1,854,932
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
Years ending December 31, |  | Amount
2019 |  | $ | 123,662
2020 |  |  | 123,662
2021 |  |  | 123,662
2022 |  |  | 123,662
2023 |  |  | 123,662
Thereafter |  |  | 1,236,622
|  | $ | 1,854,932

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