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Note 2 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Securities held to maturity: |  |
Securities held to maturity, due in one year or less, amortized cost | $ 1,732,495 |
Securities held to maturity, due in one year or less, fair value | 1,737,807 |
Securities held to maturity, due after one year through five years, amortized cost | 25,021,326 |
Securities held to maturity, due after one year through five years, fair value | 25,051,928 |
Securities held to maturity, due after five years, amortized cost | 373,298,523 |
Securities held to maturity, due after five years, fair value | 370,462,633 |
Securities held to maturity, amortized cost | 400,052,344 |
Securities held to maturity, fair value | 397,252,368 | $ 379,749,804
Securities available for sale: |  |
Securities available for sale, due in one year or less, amortized cost | 2,882,932 |
Securities available for sale, Due in one year or less, fair value | 2,891,934 |
Securities available for sale, due after one year through five years, amortized cost | 25,265,433 |
Securities available for sale, Due after one year through five years, fair value | 24,969,540 |
Securities available for sale, due after five years, amortized cost | 73,034,280 |
Securities available for sale, Due after five years, fair value | 71,548,749 |
Securities available for sale, single maturity, amortized cost | 101,182,645 |
Securities available for sale, single maturity, fair value | 99,410,223 |
Securities available for sale, amortized cost | 265,974,360 |
Securities available for sale, fair value | 257,944,671 |
Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, no single maturity, amortized cost | 57,729,505 |
Securities available for sale, no single maturity, fair value | 56,865,270 |
Securities available for sale, callable, amortized cost | 57,729,505 |
Securities available for sale, callable, fair value | 56,865,270 |
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | 396,217,718 | 378,699,804
US States and Political Subdivisions Debt Securities [Member] | Callable Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, callable, amortized cost | 232,556,893 |
Securities held to maturity, callable, fair value | 230,900,385 |
Securities available for sale: |  |
Securities available for sale, no single maturity, amortized cost | 52,730,591 |
Securities available for sale, no single maturity, fair value | 51,992,220 |
Securities available for sale, callable, amortized cost | 52,730,591 |
Securities available for sale, callable, fair value | 51,992,220 |
US Government-sponsored Enterprises Debt Securities [Member] | Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, no single maturity, amortized cost | 4,998,914 |
Securities available for sale, no single maturity, fair value | 4,873,050 |
Securities available for sale, callable, amortized cost | 4,998,914 |
Securities available for sale, callable, fair value | 4,873,050 |
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, no single maturity, amortized cost | 164,791,715 |
Securities available for sale, no single maturity, fair value | 158,534,448 |
Securities available for sale, callable, amortized cost | 164,791,715 |
Securities available for sale, callable, fair value | 158,534,448 |
Other Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | $ 1,034,650 | $ 1,050,000

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