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Note 3 - Investment Securities (Details) - Investment Securities - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
U.S. Government Agencies |  |
Available for sale securities, amortized cost | $ 302,868,012 | $ 281,935,455
Available for sale securities, gross unrealized gains | 93,357 | 183,083
Available for sale securities, gross unrealized losses | (6,812,070) | (7,523,952)
Available for sale securities, fair value | 296,149,299 | 274,594,586
Securities Held to Maturity |  |
State, County and Municipal |  | 29,796
State, County and Municipal |  | 29,923
US Government Agencies Debt Securities [Member] |  |
U.S. Government Agencies |  |
Available for sale securities, amortized cost | 297,778,875 | 278,419,055
Available for sale securities, gross unrealized gains | 62,815 | 155,902
Available for sale securities, gross unrealized losses | (6,791,837) | (7,511,288)
Available for sale securities, fair value | 291,049,853 | 271,063,669
US States and Political Subdivisions Debt Securities [Member] |  |
U.S. Government Agencies |  |
Available for sale securities, amortized cost | 5,089,137 | 3,516,400
Available for sale securities, gross unrealized gains | 30,542 | 27,181
Available for sale securities, gross unrealized losses | (20,233) | (12,664)
Available for sale securities, fair value | $ 5,099,446 | 3,530,917
Securities Held to Maturity |  |
State, County and Municipal |  | 29,796
State, County and Municipal |  | 127
State, County and Municipal |  | 0
State, County and Municipal |  | $ 29,923

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