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Note 2 - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) | Jun. 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 | $ 5,805,354 | $ 14,803,408
Securities held to maturity, less than 12 months, gross unrealized losses | (384,457) | (294,438)
Securities held to maturity, 12 months or more, fair value | 14,508,402 | 19,927,581
Securities held to maturity, 12 months or more, gross unrealized losses | (346,713) | (878,994)
Securities held to maturity, fair value | 20,313,756 | 34,730,989
Securities held to maturity, gross unrealized losses | (731,170) | (1,173,432)
Securities available for sale, less than 12 months, fair value | 380,749 | 2,220,800
Securities available for sale, less than 12 months, gross unrealized losses | (206) | (31,807)
Securities available for sale, 12 months or more, fair value | 850,050 | 848,329
Securities available for sale, 12 months or more, gross unrealized losses | (16,159) | (27,571)
Securities available for sale, fair value | 1,230,799 | 3,069,129
Securities available for sale, gross unrealized losses | (16,365) | (59,378)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 5,825,476 | 112,900,327
Securities available for sale, less than 12 months, gross unrealized losses | (80,276) | (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 | 5,825,476 | 177,376,988
Securities available for sale, gross unrealized losses | (80,276) | (2,848,561)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 4,337,187 | 40,356,921
Securities available for sale, less than 12 months, gross unrealized losses | (7,492) | (730,466)
Securities available for sale, 12 months or more, fair value | 8,829,330 | 19,836,637
Securities available for sale, 12 months or more, gross unrealized losses | (72,784) | (552,973)
Securities available for sale, fair value | 13,166,517 | 60,193,558
Securities available for sale, gross unrealized losses | (80,276) | (1,283,439)
Other Securities [Member] |  |
Securities available for sale, less than 12 months, fair value |  | 411
Securities available for sale, less than 12 months, gross unrealized losses |  | (163)
Securities available for sale, fair value |  | 411
Securities available for sale, gross unrealized losses |  | (163)
Securities available for sale, less than 12 months, fair value | 10,543,412 | 155,478,459
Securities available for sale, less than 12 months, gross unrealized losses | (87,974) | (2,160,027)
Securities available for sale, 12 months or more, fair value | 9,679,380 | 85,161,627
Securities available for sale, 12 months or more, gross unrealized losses | (88,943) | (2,031,514)
Securities available for sale, fair value | 20,222,792 | 240,640,086
Securities available for sale, gross unrealized losses | $ (176,917) | $ (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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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: 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 Reference 2: 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 + Details
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