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Note 2 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
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Securities held to maturity, less than 12 months, fair value | $ 70,443,057 |
Securities held to maturity, less than 12 months, gross unrealized losses | (2,892,207) |
Securities held to maturity, 12 months or more, fair value | 59,545,239 |
Securities held to maturity, 12 months or more, gross unrealized losses | (2,143,665) |
Securities held to maturity, fair value | 129,988,296 |
Securities held to maturity, gross unrealized losses | (5,035,872) |
Securities available for sale, less than 12 months, fair value | 160,591,830 | $ 128,656,909
Securities available for sale, less than 12 months, gross unrealized losses | (4,107,585) | (1,138,843)
Securities available for sale, 12 months or more, fair value | 67,246,086 | 71,569,641
Securities available for sale, 12 months or more, gross unrealized losses | (2,761,523) | (1,761,568)
Securities available for sale, fair value | 227,837,916 | 200,226,550
Securities available for sale, gross unrealized losses | (6,869,108) | (2,900,411)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity, less than 12 months, fair value | 69,404,232 | 23,750,826
Securities held to maturity, less than 12 months, gross unrealized losses | (2,881,032) | (354,460)
Securities held to maturity, 12 months or more, fair value | 59,545,239 | 72,611,780
Securities held to maturity, 12 months or more, gross unrealized losses | (2,143,665) | (2,133,659)
Securities held to maturity, fair value | 128,949,471 | 96,362,606
Securities held to maturity, gross unrealized losses | (5,024,697) | (2,488,119)
Securities available for sale, less than 12 months, fair value | 36,845,821 | 10,229,337
Securities available for sale, less than 12 months, gross unrealized losses | (659,492) | (41,151)
Securities available for sale, 12 months or more, fair value | 8,217,318 | 9,997,433
Securities available for sale, 12 months or more, gross unrealized losses | (239,952) | (169,949)
Securities available for sale, fair value | 45,063,139 | 20,226,770
Securities available for sale, gross unrealized losses | (899,444) | (211,100)
Other Securities [Member] |  |
Securities held to maturity, less than 12 months, fair value | 1,038,825 |
Securities held to maturity, less than 12 months, gross unrealized losses | (11,175) |
Securities held to maturity, 12 months or more, fair value |  |
Securities held to maturity, fair value | 1,038,825 |
Securities held to maturity, gross unrealized losses | (11,175) |
Securities available for sale, less than 12 months, fair value |  | 923,535
Securities available for sale, less than 12 months, gross unrealized losses |  | (25,815)
Securities available for sale, 12 months or more, fair value |  |
Securities available for sale, 12 months or more, gross unrealized losses |  |
Securities available for sale, fair value |  | 923,535
Securities available for sale, gross unrealized losses |  | (25,815)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 29,643,497 | 28,576,258
Securities available for sale, less than 12 months, gross unrealized losses | (589,515) | (200,022)
Securities available for sale, 12 months or more, fair value | 3,634,609 | 3,640,477
Securities available for sale, 12 months or more, gross unrealized losses | (155,365) | (149,945)
Securities available for sale, fair value | 33,278,106 | 32,216,735
Securities available for sale, gross unrealized losses | (744,880) | (349,967)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale, less than 12 months, fair value | 94,102,512 | 88,927,779
Securities available for sale, less than 12 months, gross unrealized losses | (2,858,578) | (871,855)
Securities available for sale, 12 months or more, fair value | 55,394,159 | 57,931,731
Securities available for sale, 12 months or more, gross unrealized losses | (2,366,206) | (1,441,674)
Securities available for sale, fair value | 149,496,671 | 146,859,510
Securities available for sale, gross unrealized losses | $ (5,224,784) | $ (2,313,529)

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 No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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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- 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 less than twelve months. + References No definition available. + Details
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