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Note 2 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities held to maturity, due in one year or less, amortized cost | $ 3,344,356 |
Securities held to maturity, due in one year or less, fair value | 3,345,990 |
Securities held to maturity, due after one year through five years, amortized cost | 25,163,524 |
Securities held to maturity, due after one year through five years, fair value | 25,191,668 |
Securities held to maturity, due after five years, amortized cost | 350,076,457 |
Securities held to maturity, due after five years, fair value | 347,255,025 |
Securities held to maturity, amortized cost | 378,584,337 |
Securities held to maturity, fair value | 375,792,683 | $ 379,749,804
Securities available for sale, due in one year or less, amortized cost | 3,368,633 |
Securities available for sale, Due in one year or less, fair value | 3,381,748 |
Securities available for sale, due after one year through five years, amortized cost | 23,949,100 |
Securities available for sale, Due after one year through five years, fair value | 23,738,028 |
Securities available for sale, due after five years, amortized cost | 76,390,803 |
Securities available for sale, Due after five years, fair value | 75,236,121 |
Securities available for sale, single maturity, amortized cost | 103,708,536 |
Securities available for sale, single maturity, fair value | 102,355,897 |
Securities available for sale, amortized cost | 266,162,141 |
Securities available for sale, fair value | 259,644,940 |
Callable Securities [Member] |  |
Securities available for sale, amortized cost | 59,065,640 |
Securities available for sale, fair value | 58,206,494 |
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity, fair value | 374,753,858 | $ 378,699,804
US States and Political Subdivisions Debt Securities [Member] | Callable Securities [Member] |  |
Securities available for sale, no single maturity, amortized cost | 54,016,828 |
Securities available for sale, no single maturity, fair value | 53,258,850 |
Securities available for sale, callable, amortized cost | 54,016,828 |
Securities available for sale, callable, fair value | 53,258,850 |
US Government Agencies Debt Securities [Member] | Callable Securities [Member] |  |
Securities available for sale, no single maturity, amortized cost | 5,048,812 |
Securities available for sale, no single maturity, fair value | 4,947,644 |
Securities available for sale, callable, amortized cost | 5,048,812 |
Securities available for sale, callable, fair value | 4,947,644 |
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale, no single maturity, amortized cost | 162,453,605 |
Securities available for sale, no single maturity, fair value | 157,289,043 |
Securities available for sale, callable, amortized cost | 162,453,605 |
Securities available for sale, callable, fair value | 157,289,043 |
Callable Securities [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity, callable, amortized cost | 209,306,946 |
Securities held to maturity, callable, fair value | $ 207,262,788 |

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