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Note 2 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
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US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity, less than 12 months, fair value | $ 23,632,888 | $ 14,803,408
Securities held to maturity, less than 12 months, gross unrealized losses | (251,558) | (294,438)
Securities held to maturity, 12 months or more, fair value | 14,150,396 | 19,927,581
Securities held to maturity, 12 months or more, gross unrealized losses | (527,424) | (878,994)
Securities held to maturity, fair value | 37,783,284 | 34,730,989
Securities held to maturity, gross unrealized losses | (778,982) | (1,173,432)
Securities available for sale, less than 12 months, fair value | 25,921,780 | 2,220,800
Securities available for sale, less than 12 months, gross unrealized losses | (49,087) | (31,807)
Securities available for sale, 12 months or more, fair value | 846,894 | 848,329
Securities available for sale, 12 months or more, gross unrealized losses | (14,412) | (27,571)
Securities available for sale, fair value | 26,768,674 | 3,069,129
Securities available for sale, gross unrealized losses | (63,499) | (59,378)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 9,547,746 | 112,900,327
Securities available for sale, less than 12 months, gross unrealized losses | (73,463) | (1,397,591)
Securities available for sale, 12 months or more, fair value |  | 64,476,661
Securities available for sale, 12 months or more, gross unrealized losses |  | (1,450,970)
Securities available for sale, fair value | 9,547,746 | 177,376,988
Securities available for sale, gross unrealized losses | (73,463) | (2,848,561)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 9,326,000 | 40,356,921
Securities available for sale, less than 12 months, gross unrealized losses | (78,305) | (730,466)
Securities available for sale, 12 months or more, fair value | 8,464,738 | 19,836,637
Securities available for sale, 12 months or more, gross unrealized losses | (69,247) | (552,973)
Securities available for sale, fair value | 17,790,738 | 60,193,558
Securities available for sale, gross unrealized losses | (147,552) | (1,283,439)
Other Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 641,430 | 411
Securities available for sale, less than 12 months, gross unrealized losses | (3,227) | (163)
Securities available for sale, fair value | 641,430 | 411
Securities available for sale, gross unrealized losses | (3,227) | (163)
Securities available for sale, less than 12 months, fair value | 45,436,956 | 155,478,459
Securities available for sale, less than 12 months, gross unrealized losses | (204,082) | (2,160,027)
Securities available for sale, 12 months or more, fair value | 9,311,632 | 85,161,627
Securities available for sale, 12 months or more, gross unrealized losses | (83,659) | (2,031,514)
Securities available for sale, fair value | 54,748,588 | 240,640,086
Securities available for sale, gross unrealized losses | $ (287,741) | $ (4,191,541)

X
- 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=73527792&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=73527792&loc=d3e27337-111563 + Details
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