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Note 2 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
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Securities held to maturity, at amortized cost | $ 378,584,337 | $ 379,474,205
Securities held to maturity, gross unrealized gains | 2,244,218 | 2,763,718
Securities held to maturity, gross unrealized (losses) | (5,035,872) | (2,488,119)
HTM | 375,792,683 | 379,749,804
Securities available for sale, amortized cost | 266,162,141 | 274,058,995
Securities available for sale, gross unrealized gains | 351,908 | 1,749,323
Securities available for sale, gross unrealized (losses) | (6,869,109) | (2,900,411)
AFS | 259,644,940 | 272,907,907
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity, at amortized cost | 377,534,337 | 378,424,205
Securities held to maturity, gross unrealized gains | 2,244,218 | 2,763,718
Securities held to maturity, gross unrealized (losses) | (5,024,697) | (2,488,119)
HTM | 374,753,858 | 378,699,804
Securities available for sale, amortized cost | 61,862,665 | 66,176,364
Securities available for sale, gross unrealized gains | 238,583 | 660,232
Securities available for sale, gross unrealized (losses) | (899,444) | (211,100)
AFS | 61,201,804 | 66,625,496
Other Securities [Member] |  |
Securities held to maturity, at amortized cost | 1,050,000 | 1,050,000
Securities held to maturity, gross unrealized gains |  |
Securities held to maturity, gross unrealized (losses) | (11,175) |
HTM | 1,038,825 | 1,050,000
Securities available for sale, amortized cost | 4,254,716 | 4,014,004
Securities available for sale, gross unrealized gains | 31,867 | 896,384
Securities available for sale, gross unrealized (losses) |  | (25,815)
AFS | 4,286,583 | 4,884,573
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, amortized cost | 37,591,155 | 38,409,157
Securities available for sale, gross unrealized gains | 21,236 | 37,344
Securities available for sale, gross unrealized (losses) | (744,881) | (349,967)
AFS | 36,867,510 | 38,096,534
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale, amortized cost | 162,453,605 | 165,459,470
Securities available for sale, gross unrealized gains | 60,222 | 155,363
Securities available for sale, gross unrealized (losses) | (5,224,784) | (2,313,529)
AFS | $ 157,289,043 | $ 163,301,304

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity). + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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