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Note 2 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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Securities held to maturity: |  |
Securities held to maturity, at amortized cost | $ 400,052,344 | $ 379,474,205
Securities held to maturity, gross unrealized gains | 4,916,288 | 2,763,718
Securities held to maturity, gross unrealized (losses) | (7,716,264) | (2,488,119)
Securities held to maturity, fair value | 397,252,368 | 379,749,804
Securities available for sale: |  |
Securities available for sale, amortized Cost | 265,974,360 | 274,058,995
Securities available for sale, gross unrealized gains | 278,899 | 1,749,323
Securities available for sale, gross unrealized (losses) | (8,308,588) | (2,900,411)
Securities available for sale, fair value | 257,944,671 | 272,907,907
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, at amortized cost | 399,002,344 | 378,424,205
Securities held to maturity, gross unrealized gains | 4,916,288 | 2,763,718
Securities held to maturity, gross unrealized (losses) | (7,700,914) | (2,488,119)
Securities held to maturity, fair value | 396,217,718 | 378,699,804
Securities available for sale: |  |
Securities available for sale, amortized Cost | 60,160,248 | 66,176,364
Securities available for sale, gross unrealized gains | 221,112 | 660,232
Securities available for sale, gross unrealized (losses) | (874,093) | (211,100)
Securities available for sale, fair value | 59,507,267 | 66,625,496
Other Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, at amortized cost | 1,050,000 | 1,050,000
Securities held to maturity, gross unrealized (losses) | (15,350) |
Securities held to maturity, fair value | 1,034,650 | 1,050,000
Securities available for sale: |  |
Securities available for sale, amortized Cost | 4,254,509 | 4,014,004
Securities available for sale, gross unrealized gains |  | 896,384
Securities available for sale, gross unrealized (losses) | (18,089) | (25,815)
Securities available for sale, fair value | 4,236,420 | 4,884,573
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized Cost | 36,767,888 | 38,409,157
Securities available for sale, gross unrealized gains | 7,872 | 37,344
Securities available for sale, gross unrealized (losses) | (1,109,224) | (349,967)
Securities available for sale, fair value | 35,666,536 | 38,096,534
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized Cost | 164,791,715 | 165,459,470
Securities available for sale, gross unrealized gains | 49,915 | 155,363
Securities available for sale, gross unrealized (losses) | (6,307,182) | (2,313,529)
Securities available for sale, fair value | $ 158,534,448 | $ 163,301,304

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- 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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