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Note 3 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities held to maturity: |  |
Securities held to maturity, due in one year or less, amortized cost | $ 2,232,726 |
Securities held to maturity, due in one year or less, fair value | 2,237,767 |
Securities held to maturity, due after one year through five years, amortized cost | 27,569,566 |
Securities held to maturity, due after one year through five years, fair value | 27,716,775 |
Securities held to maturity, due after five years, amortized cost | 372,110,593 |
Securities held to maturity, due after five years, fair value | 370,816,041 |
Securities held to maturity, amortized cost | 401,912,885 |
Securities held to maturity, fair value | 400,770,583 | $ 379,749,804
Securities available for sale: |  |
Securities available for sale, due in one year or less, amortized cost | 2,665,560 |
Securities available for sale, Due in one year or less, fair value | 2,665,829 |
Securities available for sale, due after one year through five years, amortized cost | 29,140,442 |
Securities available for sale, Due after one year through five years, fair value | 28,856,751 |
Securities available for sale, due after five years, amortized cost | 71,167,855 |
Securities available for sale, Due after five years, fair value | 70,284,608 |
Securities available for sale, single maturity, amortized cost | 102,973,857 |
Securities available for sale, single maturity, fair value | 101,807,188 |
Securities available for sale, amortized cost | 266,671,830 |
Securities available for sale, fair value | 261,056,448 |
Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 61,220,638 |
Securities available for sale, fair value | 60,631,128 |
US States and Political Subdivisions Debt Securities |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | 399,721,215 | 378,699,804
US States and Political Subdivisions Debt Securities | Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, no single maturity, amortized cost | 49,715,648 |
Securities available for sale, no single maturity, fair value | 49,110,178 |
Securities available for sale, callable, amortized cost | 49,715,648 |
Securities available for sale, callable, fair value | 49,110,178 |
U.S. govt. sponsored agency securities | Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, no single maturity, amortized cost | 4,999,072 |
Securities available for sale, no single maturity, fair value | 4,918,050 |
Securities available for sale, callable, amortized cost | 4,999,072 |
Securities available for sale, callable, fair value | 4,918,050 |
Residential Mortgage Backed Securities |  |
Securities available for sale: |  |
Securities available for sale, no single maturity, amortized cost | 163,697,973 |
Securities available for sale, no single maturity, fair value | 159,249,260 |
Securities available for sale, callable, amortized cost | 163,697,973 |
Securities available for sale, callable, fair value | 159,249,260 |
Other Securities |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | 1,049,368 | $ 1,050,000
Other Securities | Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, no single maturity, amortized cost | 6,505,918 |
Securities available for sale, no single maturity, fair value | 6,602,900 |
Securities available for sale, callable, amortized cost | 6,505,918 |
Securities available for sale, callable, fair value | 6,602,900 |
Callable Securities [Member] | US States and Political Subdivisions Debt Securities |  |
Securities held to maturity: |  |
Securities held to maturity, callable, amortized cost | 209,953,250 |
Securities held to maturity, callable, fair value | $ 208,366,466 |

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