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Note 4 - Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturity (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Due In One Year or Less, amortized cost | $ 354,440 |
Due In One Year or Less, fair value | 353,794 |
Due After One Year Through Five Years, amortized cost | 4,294,198 |
Due After One Year Through Five Years, fair value | 4,237,813 |
Due After Five Years Through Ten Years, amortized cost | 1,133,881 |
Due After Five Years Through Ten Years, fair value | 1,150,770 |
Due After Ten Years, amortized cost | 1,152,511 |
Due After Ten Years, fair value | 1,118,617 |
Amortized cost with single maturity date | 6,935,030 |
Fair value with single maturity date | 6,860,994 |
Mortgage-Backed Securities, amortized cost | 356,498,339 |
Mortgage-Backed Securities, fair value | 346,205,172 |
Amortized cost | 363,433,369 | $ 362,464,561
Fair Value | $ 353,066,166 | $ 354,246,904

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