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Note 3 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Securities held to maturity: |  |
Securities held to maturity, at amortized cost | $ 379,474,205 | $ 322,909,056
Securities held to maturity, gross unrealized gains | 2,763,718 | 2,200,577
Securities held to maturity, gross unrealized (losses) | (2,488,119) | (4,694,734)
Securities held to maturity, fair value | 379,749,804 | 320,414,899
Securities available for sale: |  |
Securities available for sale, amortized cost | 274,058,995 | 253,609,401
Securities available for sale, gross unrealized gains | 1,749,323 | 1,437,658
Securities available for sale, gross unrealized (losses) | (2,900,411) | (3,933,920)
Securities available for sale, fair value | 272,907,907 | 251,113,139
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, at amortized cost | 378,424,205 | 321,859,056
Securities held to maturity, gross unrealized gains | 2,763,718 | 2,200,577
Securities held to maturity, gross unrealized (losses) | (2,488,119) | (4,694,734)
Securities held to maturity, fair value | 378,699,804 | 319,364,899
Securities available for sale: |  |
Securities available for sale, amortized cost | 66,176,364 | 52,816,541
Securities available for sale, gross unrealized gains | 660,232 | 425,801
Securities available for sale, gross unrealized (losses) | (211,100) | (637,916)
Securities available for sale, fair value | 66,625,496 | 52,604,426
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 gains |  |
Securities held to maturity, gross unrealized (losses) |  |
Securities held to maturity, fair value | 1,050,000 | 1,050,000
Securities available for sale: |  |
Securities available for sale, amortized cost | 4,014,004 | 4,046,332
Securities available for sale, gross unrealized gains | 896,384 | 703,978
Securities available for sale, gross unrealized (losses) | (25,815) | (27,331)
Securities available for sale, fair value | 4,884,573 | 4,722,979
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 38,409,157 | 46,281,306
Securities available for sale, gross unrealized gains | 37,344 | 132,886
Securities available for sale, gross unrealized (losses) | (349,967) | (330,585)
Securities available for sale, fair value | 38,096,534 | 46,083,607
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 165,459,470 | 150,465,222
Securities available for sale, gross unrealized gains | 155,363 | 174,993
Securities available for sale, gross unrealized (losses) | (2,313,529) | (2,938,088)
Securities available for sale, fair value | $ 163,301,304 | $ 147,702,127

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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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://www.xbrl.org/2003/role/presentationRef -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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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