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Note 8 - Deposits (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Maturities of Certificates of Deposit [Table Text Block] |
Year ending December 31: |  |  |
2019 |  | $ | 796,333,079
2020 |  |  | 116,147,111
2021 |  |  | 31,872,141
2022 |  |  | 20,834,858
2023 |  |  | 9,258,973
Thereafter |  |  | 257,874
|  | $ | 974,704,036
Schedules of Collateralized Investment Securities Table Text Block |
|  | 2018 |  | 2017
U.S. govt. sponsored agency securities |  | $ | 980,160 |  | $ | 983,670
Residential mortgage-backed and related securities |  |  | 9,882,921 |  |  | 9,035,755
|  | $ | 10,863,081 |  | $ | 10,019,425

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