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Note 11 - Other Borrowings and Unused Lines of Credit (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Debt [Table Text Block] |
|  | 2017 |  |  | 2016 |
Wholesale structured repurchase agreements |  | $ | 35,000,000 |  |  | $ | 45,000,000 |
Term notes |  |  | 31,000,000 |  |  |  | 30,000,000 |
Revolving line of credit |  |  | - |  |  |  | 5,000,000 |
|  | $ | 66,000,000 |  |  | $ | 80,000,000 |
Schedule of Wholesale Repurchase Agreements [Table Text Block] |
|  | 2017 |  |  | 2016 |
U.S. govt. sponsored agency securities |  | $ | 3,474,555 |  |  | $ | 20,798,703 |
Residential mortgage-backed and related securities |  |  | 61,528,167 |  |  |  | 31,321,028 |
Total securities pledged to wholesale customer repurchase agreements |  |  | 65,002,722 |  |  |  | 52,119,731 |
Less: overcollateralized position |  |  | 30,002,722 |  |  |  | 7,119,731 |
|  | $ | 35,000,000 |  |  | $ | 45,000,000 |
Schedule of Prepayments of Debt [Table Text Block] |
2016 |
Date of Restructuring |  | Amount |  |  | Weighted Average Interest Rate |  | Range of Maturity Dates |  | Prepayment Fees |
First Quarter of 2016 |  | $ | 10,000,000 |  |  |  | 3.97 | % | July 2018 |  | $ | 759,000 |
Third Quarter of 2016 |  |  | 55,000,000 |  |  |  | 3.27 | % | February 2019 to September 2020 |  |  | 4,010,000 |
Total for 2016 |  | $ | 65,000,000 |  |  |  | 3.38 | % |  |  | $ | 4,769,000 |
Schedule of Line of Credit Facilities [Table Text Block] |
|  | December 31, 2017 |  | December 31, 2016 |
|  |  |  |  |  | Weighted |  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |  |  |  |  |  | Average |
|  |  |  |  |  | Interest Rate |  |  |  |  |  | Interest Rate |
|  | Amount Due |  |  | at Year-End |  | Amount Due |  |  | at Year-End |
Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ending December 31: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  | $ | - |  |  |  | - |  |  | $ | 10,000,000 |  |  | 3.00 | % |
2019 |  |  | 10,000,000 |  |  |  | 3.44 |  |  |  | 10,000,000 |  |  | 3.44 |  |
2020 |  |  | 25,000,000 |  |  |  | 2.48 |  |  |  | 25,000,000 |  |  | 2.48 |  |
Total Wholesale Structured Repurchase Agreements |  | $ | 35,000,000 |  |  |  | 2.76 | % |  | $ | 45,000,000 |  |  | 2.81 | % |
Schedule of Maturities of Long-term Debt [Table Text Block] |
|  | As of December 31, 2017 |
2018 |  | $ | 7,750,000 |
2019 |  |  | 7,750,000 |
2020 |  |  | 7,750,000 |
2021 |  |  | 7,750,000 |
|  | $ | 31,000,000 |
Whole sale Repurchase Agreements [Member] |
Notes Tables |
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block] |
|  | 2017 |  |  | 2016 |
Secured |  | $ | 2,967,441 |  |  | $ | 34,409,192 |
Unsecured |  |  | 372,000,000 |  |  |  | 347,000,000 |
|  | $ | 374,967,441 |  |  | $ | 381,409,192 |

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