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Note 2 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
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Securities HTM: |  |
Securities held to maturity, at amortized cost | $ 306,694,063 | $ 322,909,056
Securities held to maturity, gross unrealized gains | 2,193,278 | 2,200,577
Securities held to maturity, gross unrealized (losses) | (4,690,335) | (4,694,734)
| 304,197,006 | 320,414,899
Securities AFS: |  |
Securities available for sale, amortized cost | 252,850,093 | 253,609,401
Securities available for sale, gross unrealized gains | 1,505,921 | 1,437,658
Securities available for sale, gross unrealized (losses) | (3,403,993) | (3,933,920)
Securities available for sale, fair value | 250,952,021 | 251,113,139
US States and Political Subdivisions Debt Securities [Member] |  |
Securities HTM: |  |
Securities held to maturity, at amortized cost | 305,644,063 | 321,859,056
Securities held to maturity, gross unrealized gains | 2,193,278 | 2,200,577
Securities held to maturity, gross unrealized (losses) | (4,690,335) | (4,694,734)
| 303,147,006 | 319,364,899
Securities AFS: |  |
Securities available for sale, amortized cost | 51,104,318 | 52,816,541
Securities available for sale, gross unrealized gains | 454,505 | 425,801
Securities available for sale, gross unrealized (losses) | (426,949) | (637,916)
Securities available for sale, fair value | 51,131,874 | 52,604,426
Other Securities [Member] |  |
Securities HTM: |  |
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) |  |
| 1,050,000 | 1,050,000
Securities AFS: |  |
Securities available for sale, amortized cost | 4,056,248 | 4,046,332
Securities available for sale, gross unrealized gains | 760,936 | 703,978
Securities available for sale, gross unrealized (losses) | (57,105) | (27,331)
Securities available for sale, fair value | 4,760,079 | 4,722,979
US Government Agencies Debt Securities [Member] |  |
Securities AFS: |  |
Securities available for sale, amortized cost | 47,720,622 | 46,281,306
Securities available for sale, gross unrealized gains | 130,306 | 132,886
Securities available for sale, gross unrealized (losses) | (294,847) | (330,585)
Securities available for sale, fair value | 47,556,081 | 46,083,607
Residential Mortgage Backed Securities [Member] |  |
Securities AFS: |  |
Securities available for sale, amortized cost | 149,968,905 | 150,465,222
Securities available for sale, gross unrealized gains | 160,174 | 174,993
Securities available for sale, gross unrealized (losses) | (2,625,092) | (2,938,088)
Securities available for sale, fair value | $ 147,503,987 | $ 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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