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Note 2 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
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US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity, at amortized cost | $ 305,690,174 | $ 252,624,159
Securities held to maturity, gross unrealized gains | 5,533,151 | 3,190,558
Securities held to maturity, gross unrealized (losses) | (778,982) | (1,173,432)
HTM | 310,444,343 | 254,641,285
Securities available for sale, amortized cost | 53,887,898 | 26,764,981
Securities available for sale, gross unrealized gains | 816,063 | 872,985
Securities available for sale, gross unrealized (losses) | (63,499) | (59,378)
AFS | 54,640,462 | 27,578,588
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) |  |
HTM | 1,050,000 | 1,050,000
Securities available for sale, amortized cost | 2,002,113 | 1,108,124
Securities available for sale, gross unrealized gains | 492,980 | 540,919
Securities available for sale, gross unrealized (losses) | (3,227) | (163)
AFS | 2,491,866 | 1,648,880
US Government Agencies Debt Securities [Member] |  |
Securities available for sale, amortized cost | 66,966,328 | 216,281,416
Securities available for sale, gross unrealized gains | 992,084 | 104,524
Securities available for sale, gross unrealized (losses) | (73,463) | (2,848,561)
AFS | 67,884,949 | 213,537,379
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale, amortized cost | 131,496,011 | 81,442,479
Securities available for sale, gross unrealized gains | 1,824,345 | 511,095
Securities available for sale, gross unrealized (losses) | (147,552) | (1,283,439)
AFS | 133,172,804 | 80,670,135
Securities held to maturity, at amortized cost | 306,740,174 | 253,674,159
Securities held to maturity, gross unrealized gains | 5,533,151 | 3,190,558
Securities held to maturity, gross unrealized (losses) | (778,982) | (1,173,432)
HTM | 311,494,343 | 255,691,285
Securities available for sale, amortized cost | 254,352,350 | 325,597,000
Securities available for sale, gross unrealized gains | 4,125,472 | 2,029,523
Securities available for sale, gross unrealized (losses) | (287,741) | (4,191,541)
AFS | $ 258,190,081 | $ 323,434,982

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=65884222&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=73527792&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=66010992&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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27232-111563 + Details
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