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Note 2 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position - USD ($) | Mar. 31, 2016 | Dec. 31, 2015
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Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | $ 44,855,847 | $ 155,478,459
Securities available for sale, less than 12 months, gross unrealized losses | (162,212) | (2,160,027)
Securities available for sale, 12 months or more, fair value | 35,505,056 | 85,161,627
Securities available for sale, 12 months or more, gross unrealized losses | (309,434) | (2,031,514)
Securities available for sale, fair value | 80,360,903 | 240,640,086
Securities available for sale, gross unrealized losses | (471,646) | (4,191,541)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | 16,874,982 | 14,803,408
Securities held to maturity, less than 12 months, gross unrealized losses | (669,283) | (294,438)
Securities held to maturity, 12 months or more, fair value | 7,610,345 | 19,927,581
Securities held to maturity, 12 months or more, gross unrealized losses | (189,546) | (878,994)
Securities held to maturity, fair value | 24,485,327 | 34,730,989
Securities held to maturity, gross unrealized losses | (858,829) | (1,173,432)
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 1,157,233 | 2,220,800
Securities available for sale, less than 12 months, gross unrealized losses | (2,185) | (31,807)
Securities available for sale, 12 months or more, fair value | 849,972 | 848,329
Securities available for sale, 12 months or more, gross unrealized losses | (21,058) | (27,571)
Securities available for sale, fair value | 2,007,205 | 3,069,129
Securities available for sale, gross unrealized losses | (23,243) | (59,378)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 24,512,886 | 112,900,327
Securities available for sale, less than 12 months, gross unrealized losses | (76,931) | (1,397,591)
Securities available for sale, 12 months or more, fair value | 4,946,100 | 64,476,661
Securities available for sale, 12 months or more, gross unrealized losses | (48,607) | (1,450,970)
Securities available for sale, fair value | 29,458,986 | 177,376,988
Securities available for sale, gross unrealized losses | (125,538) | (2,848,561)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 18,687,105 | 40,356,921
Securities available for sale, less than 12 months, gross unrealized losses | (81,719) | (730,466)
Securities available for sale, 12 months or more, fair value | 29,708,984 | 19,836,637
Securities available for sale, 12 months or more, gross unrealized losses | (239,769) | (552,973)
Securities available for sale, fair value | 48,396,089 | 60,193,558
Securities available for sale, gross unrealized losses | (321,488) | (1,283,439)
Other Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 498,623 | 411
Securities available for sale, less than 12 months, gross unrealized losses | (1,377) | (163)
Securities available for sale, fair value | 498,623 | 411
Securities available for sale, gross unrealized losses | $ (1,377) | $ (163)

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