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Note 2 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
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Securities available for sale, less than 12 months, fair value | $ 175,431,980 | $ 180,624,957
Securities available for sale, less than 12 months, gross unrealized losses | (2,962,362) | (3,545,097)
Securities available for sale, 12 months or more, fair value | 14,634,006 | 13,274,726
Securities available for sale, 12 months or more, gross unrealized losses | (441,631) | (388,823)
Securities available for sale, fair value | 190,065,986 | 193,899,683
Securities available for sale, gross unrealized losses | (3,403,993) | (3,933,920)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity, less than 12 months, fair value | 110,858,743 | 122,271,533
Securities held to maturity, less than 12 months, gross unrealized losses | (3,751,123) | (4,076,647)
Securities held to maturity, 12 months or more, fair value | 15,350,772 | 13,010,803
Securities held to maturity, 12 months or more, gross unrealized losses | (939,212) | (618,087)
Securities held to maturity, fair value | 126,209,515 | 135,282,336
Securities held to maturity, gross unrealized losses | (4,690,335) | (4,694,734)
Securities available for sale, less than 12 months, fair value | 29,386,855 | 34,152,822
Securities available for sale, less than 12 months, gross unrealized losses | (408,233) | (618,462)
Securities available for sale, 12 months or more, fair value | 337,522 | 338,099
Securities available for sale, 12 months or more, gross unrealized losses | (18,716) | (19,454)
Securities available for sale, fair value | 29,724,377 | 34,490,921
Securities available for sale, gross unrealized losses | (426,949) | (637,916)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 18,742,054 | 21,788,139
Securities available for sale, less than 12 months, gross unrealized losses | (230,974) | (257,640)
Securities available for sale, 12 months or more, fair value | 5,115,200 | 5,499,012
Securities available for sale, 12 months or more, gross unrealized losses | (63,873) | (72,945)
Securities available for sale, fair value | 23,857,254 | 27,287,151
Securities available for sale, gross unrealized losses | (294,847) | (330,585)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 124,401,508 | 121,506,582
Securities available for sale, less than 12 months, gross unrealized losses | (2,266,050) | (2,641,664)
Securities available for sale, 12 months or more, fair value | 9,181,284 | 7,437,615
Securities available for sale, 12 months or more, gross unrealized losses | (359,042) | (296,424)
Securities available for sale, fair value | 133,582,792 | 128,944,197
Securities available for sale, gross unrealized losses | (2,625,092) | (2,938,088)
Other Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 2,901,563 | 3,177,414
Securities available for sale, less than 12 months, gross unrealized losses | (57,105) | (27,331)
Securities available for sale, fair value | 2,901,563 | 3,177,414
Securities available for sale, gross unrealized losses | $ (57,105) | $ (27,331)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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