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Note 2 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
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Securities HTM: |  |
Securities held to maturity, amortized cost | $ 323,981,227 | $ 322,909,056
Securities held to maturity, gross unrealized gains | 2,084,997 | 2,200,577
Securities held to maturity, gross unrealized (losses) | (2,629,646) | (4,694,734)
Securities held to maturity, fair value | 323,436,578 | 320,414,899
Securities AFS: |  |
Securities available for sale, amortized cost | 260,367,974 | 253,609,401
Securities available for sale, gross unrealized gains | 1,658,065 | 1,437,658
Securities available for sale, gross unrealized (losses) | (2,071,617) | (3,933,920)
Securities available for sale, fair value | 259,954,422 | 251,113,139
US States and Political Subdivisions Debt Securities [Member] |  |
Securities HTM: |  |
Securities held to maturity, amortized cost | 322,931,227 | 321,859,056
Securities held to maturity, gross unrealized gains | 2,084,997 | 2,200,577
Securities held to maturity, gross unrealized (losses) | (2,629,646) | (4,694,734)
Securities held to maturity, fair value | 322,386,578 | 319,364,899
Securities AFS: |  |
Securities available for sale, amortized cost | 56,621,412 | 52,816,541
Securities available for sale, gross unrealized gains | 435,356 | 425,801
Securities available for sale, gross unrealized (losses) | (293,708) | (637,916)
Securities available for sale, fair value | 56,763,060 | 52,604,426
Other Securities [Member] |  |
Securities HTM: |  |
Securities held to maturity, 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 AFS: |  |
Securities available for sale, amortized cost | 4,077,128 | 4,046,332
Securities available for sale, gross unrealized gains | 826,135 | 703,978
Securities available for sale, gross unrealized (losses) | (20,578) | (27,331)
Securities available for sale, fair value | 4,882,685 | 4,722,979
US Government Agencies Debt Securities [Member] |  |
Securities AFS: |  |
Securities available for sale, amortized cost | 39,340,306 | 46,281,306
Securities available for sale, gross unrealized gains | 129,768 | 132,886
Securities available for sale, gross unrealized (losses) | (129,906) | (330,585)
Securities available for sale, fair value | 39,340,168 | 46,083,607
Residential Mortgage Backed Securities [Member] |  |
Securities AFS: |  |
Securities available for sale, amortized cost | 160,329,128 | 150,465,222
Securities available for sale, gross unrealized gains | 266,806 | 174,993
Securities available for sale, gross unrealized (losses) | (1,627,425) | (2,938,088)
Securities available for sale, fair value | $ 158,968,509 | $ 147,702,127

X
- 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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- Definition Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References No definition available. + Details
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- Definition Fair value of 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 (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -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 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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