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Note 8 - Deposits (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Maturities of Certificates of Deposit [Table Text Block] |
Year ending December 31: |  |  |  |
2018 |  | $ | 478,334,220 |
2019 |  |  | 86,231,955 |
2020 |  |  | 18,143,039 |
2021 |  |  | 8,223,919 |
2022 |  |  | 5,071,695 |
Thereafter |  |  | 67,050 |
|  | $ | 596,071,878 |

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