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Note 2 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities available for sale, less than 12 months, fair value | $ 155,308,949 | $ 180,624,957
Securities available for sale, less than 12 months, gross unrealized losses | (1,575,708) | (3,545,097)
Securities available for sale, 12 months or more, fair value | 25,521,304 | 13,274,726
Securities available for sale, 12 months or more, gross unrealized losses | (495,909) | (388,823)
Securities available for sale, fair value | 180,830,253 | 193,899,683
Securities available for sale, gross unrealized losses | (2,071,617) | (3,933,920)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity, less than 12 months, fair value | 17,779,999 | 122,271,533
Securities held to maturity, less than 12 months, gross unrealized losses | (254,147) | (4,076,647)
Securities held to maturity, 12 months or more, fair value | 68,663,362 | 13,010,803
Securities held to maturity, 12 months or more, gross unrealized losses | (2,375,499) | (618,087)
Securities held to maturity, fair value | 86,443,361 | 135,282,336
Securities held to maturity, gross unrealized losses | (2,629,646) | (4,694,734)
Securities available for sale, less than 12 months, fair value | 18,776,501 | 34,152,822
Securities available for sale, less than 12 months, gross unrealized losses | (169,253) | (618,462)
Securities available for sale, 12 months or more, fair value | 12,872,616 | 338,099
Securities available for sale, 12 months or more, gross unrealized losses | (124,455) | (19,454)
Securities available for sale, fair value | 31,649,117 | 34,490,921
Securities available for sale, gross unrealized losses | (293,708) | (637,916)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 23,607,646 | 21,788,139
Securities available for sale, less than 12 months, gross unrealized losses | (129,906) | (257,640)
Securities available for sale, 12 months or more, fair value |  | 5,499,012
Securities available for sale, 12 months or more, gross unrealized losses |  | (72,945)
Securities available for sale, fair value | 23,607,646 | 27,287,151
Securities available for sale, gross unrealized losses | (129,906) | (330,585)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 111,996,030 | 121,506,582
Securities available for sale, less than 12 months, gross unrealized losses | (1,255,971) | (2,641,664)
Securities available for sale, 12 months or more, fair value | 12,648,688 | 7,437,615
Securities available for sale, 12 months or more, gross unrealized losses | (371,454) | (296,424)
Securities available for sale, fair value | 124,644,718 | 128,944,197
Securities available for sale, gross unrealized losses | (1,627,425) | (2,938,088)
Other Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 928,772 | 3,177,414
Securities available for sale, less than 12 months, gross unrealized losses | (20,578) | (27,331)
Securities available for sale, fair value | 928,772 | 3,177,414
Securities available for sale, gross unrealized losses | $ (20,578) | $ (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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