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Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | $ 114,750,055 |
Securities held to maturity, less than 12 months, gross unrealized losses | (2,187,206) |
Securities held to maturity, 12 months or more, fair value | 69,412,341 |
Securities held to maturity, 12 months or more, gross unrealized losses | (4,616,191) |
Securities held to maturity, fair value | 184,162,396 |
Securities held to maturity, gross unrealized losses | (6,803,397) |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 46,979,959 | $ 128,656,909
Securities available for sale, less than 12 months, gross unrealized losses | (580,194) | (1,138,843)
Securities available for sale, 12 months or more, fair value | 179,071,727 | 71,569,641
Securities available for sale, 12 months or more, gross unrealized losses | (5,536,124) | (1,761,568)
Securities available for sale, fair value | 226,051,686 | 200,226,550
Securities available for sale, gross unrealized losses | (6,116,318) | (2,900,411)
US States and Political Subdivisions Debt Securities |  |
Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | 114,200,687 | 23,750,826
Securities held to maturity, less than 12 months, gross unrealized losses | (2,186,574) | (354,460)
Securities held to maturity, 12 months or more, fair value | 69,412,341 | 72,611,780
Securities held to maturity, 12 months or more, gross unrealized losses | (4,616,191) | (2,133,659)
Securities held to maturity, fair value | 183,613,028 | 96,362,606
Securities held to maturity, gross unrealized losses | (6,802,765) | (2,488,119)
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 28,356,204 | 10,229,337
Securities available for sale, less than 12 months, gross unrealized losses | (394,235) | (41,151)
Securities available for sale, 12 months or more, fair value | 15,932,376 | 9,997,433
Securities available for sale, 12 months or more, gross unrealized losses | (308,750) | (169,949)
Securities available for sale, fair value | 44,288,580 | 20,226,770
Securities available for sale, gross unrealized losses | (702,985) | (211,100)
US Government Agencies Debt Securities |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 1,565,136 | 28,576,258
Securities available for sale, less than 12 months, gross unrealized losses | (33,278) | (200,022)
Securities available for sale, 12 months or more, fair value | 29,605,388 | 3,640,477
Securities available for sale, 12 months or more, gross unrealized losses | (744,385) | (149,945)
Securities available for sale, fair value | 31,170,524 | 32,216,735
Securities available for sale, gross unrealized losses | (777,663) | (349,967)
Residential Mortgage Backed Securities |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 12,809,544 | 88,927,779
Securities available for sale, less than 12 months, gross unrealized losses | (147,592) | (871,855)
Securities available for sale, 12 months or more, fair value | 133,533,963 | 57,931,731
Securities available for sale, 12 months or more, gross unrealized losses | (4,482,989) | (1,441,674)
Securities available for sale, fair value | 146,343,507 | 146,859,510
Securities available for sale, gross unrealized losses | (4,630,581) | (2,313,529)
Other Securities |  |
Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | 549,368 |
Securities held to maturity, less than 12 months, gross unrealized losses | (632) |
Securities held to maturity, fair value | 549,368 |
Securities held to maturity, gross unrealized losses | (632) |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 4,249,075 | 923,535
Securities available for sale, less than 12 months, gross unrealized losses | (5,089) | (25,815)
Securities available for sale, fair value | 4,249,075 | 923,535
Securities available for sale, gross unrealized losses | $ (5,089) | $ (25,815)

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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 No definition available. + Details
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