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Note 2 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
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Securities available for sale, fair value | $ 197,596,355 | $ 193,899,683
Securities available for sale, gross unrealized losses | (2,359,129) | (3,933,920)
Securities available for sale, less than 12 months, fair value | 183,645,208 | 180,624,957
Securities available for sale, less than 12 months, gross unrealized losses | (2,055,337) | (3,545,097)
Securities available for sale, 12 months or more, fair value | 13,951,147 | 13,274,726
Securities available for sale, 12 months or more, gross unrealized losses | (303,792) | (388,823)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities available for sale, fair value | 25,914,485 | 34,490,921
Securities available for sale, gross unrealized losses | (252,541) | (637,916)
Securities held to maturity, less than 12 months, fair value | 64,001,034 | 122,271,533
Securities held to maturity, less than 12 months, gross unrealized losses | (1,792,524) | (4,076,647)
Securities held to maturity, 12 months or more, fair value | 30,641,106 | 13,010,803
Securities held to maturity, 12 months or more, gross unrealized losses | (1,449,702) | (618,087)
Securities held to maturity, fair value | 94,642,140 | 135,282,336
Securities held to maturity, gross unrealized losses | (3,242,226) | (4,694,734)
Securities available for sale, less than 12 months, fair value | 25,578,044 | 34,152,822
Securities available for sale, less than 12 months, gross unrealized losses | (234,044) | (618,462)
Securities available for sale, 12 months or more, fair value | 336,441 | 338,099
Securities available for sale, 12 months or more, gross unrealized losses | (18,497) | (19,454)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, fair value | 32,568,525 | 27,287,151
Securities available for sale, gross unrealized losses | (189,347) | (330,585)
Securities available for sale, less than 12 months, fair value | 27,793,290 | 21,788,139
Securities available for sale, less than 12 months, gross unrealized losses | (184,702) | (257,640)
Securities available for sale, 12 months or more, fair value | 4,775,235 | 5,499,012
Securities available for sale, 12 months or more, gross unrealized losses | (4,645) | (72,945)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale, fair value | 138,186,545 | 128,944,197
Securities available for sale, gross unrealized losses | (1,894,691) | (2,938,088)
Securities available for sale, less than 12 months, fair value | 129,347,074 | 121,506,582
Securities available for sale, less than 12 months, gross unrealized losses | (1,614,041) | (2,641,664)
Securities available for sale, 12 months or more, fair value | 8,839,471 | 7,437,615
Securities available for sale, 12 months or more, gross unrealized losses | (280,650) | (296,424)
Other Securities [Member] |  |
Securities available for sale, fair value | 926,800 | 3,177,414
Securities available for sale, gross unrealized losses | (22,550) | (27,331)
Securities available for sale, less than 12 months, fair value | 926,800 | 3,177,414
Securities available for sale, less than 12 months, gross unrealized losses | $ (22,550) | $ (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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