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Note 3 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | $ 155,478,459 | $ 35,844,695
Securities available for sale, less than 12 months, gross unrealized losses | (2,160,027) | (115,453)
Securities available for sale, 12 months or more, fair value | 85,161,627 | 297,739,167
Securities available for sale, 12 months or more, gross unrealized losses | (2,031,514) | (5,752,770)
Securities available for sale, fair value | 240,640,086 | 333,583,862
Securities available for sale, gross unrealized losses | (4,191,541) | (5,868,223)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | 14,803,408 | 20,419,052
Securities held to maturity, less than 12 months, gross unrealized losses | (294,438) | (587,992)
Securities held to maturity, 12 months or more, fair value | 19,927,581 | 38,779,545
Securities held to maturity, 12 months or more, gross unrealized losses | (878,994) | (598,084)
Securities held to maturity, fair value | 34,730,989 | 59,198,597
Securities held to maturity, gross unrealized losses | (1,173,432) | (1,186,076)
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 2,220,800 | 920,935
Securities available for sale, less than 12 months, gross unrealized losses | (31,807) | (1,773)
Securities available for sale, 12 months or more, fair value | 848,329 | 4,425,337
Securities available for sale, 12 months or more, gross unrealized losses | (27,571) | (60,699)
Securities available for sale, fair value | 3,069,129 | 5,346,272
Securities available for sale, gross unrealized losses | (59,378) | (62,472)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 112,900,327 | 23,970,085
Securities available for sale, less than 12 months, gross unrealized losses | (1,397,591) | (102,695)
Securities available for sale, 12 months or more, fair value | 64,476,661 | 255,743,056
Securities available for sale, 12 months or more, gross unrealized losses | (1,450,970) | (5,161,178)
Securities available for sale, fair value | 177,376,988 | 279,713,141
Securities available for sale, gross unrealized losses | (2,848,561) | (5,263,873)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 40,356,921 | 10,710,671
Securities available for sale, less than 12 months, gross unrealized losses | (730,466) | (10,139)
Securities available for sale, 12 months or more, fair value | 19,836,637 | 37,570,774
Securities available for sale, 12 months or more, gross unrealized losses | (552,973) | (530,893)
Securities available for sale, fair value | 60,193,558 | 48,281,445
Securities available for sale, gross unrealized losses | (1,283,439) | (541,032)
Other Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 411 | 243,004
Securities available for sale, less than 12 months, gross unrealized losses | (163) | (846)
Securities available for sale, fair value | 411 | 243,004
Securities available for sale, gross unrealized losses | $ (163) | $ (846)

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