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Note 2 - Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
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Securities HTM: |  |
Securities held to maturity, at amortized cost | $ 324,203,634 | $ 322,909,056
Securities held to maturity, gross unrealized gains | 2,027,969 | 2,200,577
Securities held to maturity, gross unrealized (losses) | (3,242,226) | (4,694,734)
| 322,989,377 | 320,414,899
Securities available for sale, gross unrealized gains | 1,592,903 | 1,437,658
Securities available for sale, gross unrealized (losses) | (2,359,129) | (3,933,920)
Securities available for sale, fair value | 269,281,713 | 251,113,139
Securities AFS: |  |
Securities available for sale, amortized cost | 270,047,939 | 253,609,401
US States and Political Subdivisions Debt Securities [Member] |  |
Securities HTM: |  |
Securities held to maturity, at amortized cost | 323,153,634 | 321,859,056
Securities held to maturity, gross unrealized gains | 2,027,969 | 2,200,577
Securities held to maturity, gross unrealized (losses) | (3,242,226) | (4,694,734)
| 321,939,377 | 319,364,899
Securities available for sale, gross unrealized gains | 471,713 | 425,801
Securities available for sale, gross unrealized (losses) | (252,541) | (637,916)
Securities available for sale, fair value | 58,100,510 | 52,604,426
Securities AFS: |  |
Securities available for sale, amortized cost | 57,881,338 | 52,816,541
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 available for sale, gross unrealized gains | 778,988 | 703,978
Securities available for sale, gross unrealized (losses) | (22,550) | (27,331)
Securities available for sale, fair value | 4,821,906 | 4,722,979
Securities AFS: |  |
Securities available for sale, amortized cost | 4,065,468 | 4,046,332
US Government Agencies Debt Securities [Member] |  |
Securities HTM: |  |
Securities available for sale, gross unrealized gains | 96,651 | 132,886
Securities available for sale, gross unrealized (losses) | (189,347) | (330,585)
Securities available for sale, fair value | 41,944,464 | 46,083,607
Securities AFS: |  |
Securities available for sale, amortized cost | 42,037,160 | 46,281,306
Residential Mortgage Backed Securities [Member] |  |
Securities HTM: |  |
Securities available for sale, gross unrealized gains | 245,551 | 174,993
Securities available for sale, gross unrealized (losses) | (1,894,691) | (2,938,088)
Securities available for sale, fair value | 164,414,833 | 147,702,127
Securities AFS: |  |
Securities available for sale, amortized cost | $ 166,063,973 | $ 150,465,222

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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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