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Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities (USD $) | Jun. 30, 2014 | Dec. 31, 2013
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Securities held to maturity: |  |
Securities held to maturity, amortized cost | $ 166,787,372 | $ 145,451,895
Securities held to maturity, gross unrealized gains | 1,492,583 | 299,789
Securities held to maturity, gross unrealized losses | (2,609,628) | (7,111,579)
Securities held to maturity, fair value | 165,670,327 | 138,640,105
Securities available for sale: |  |
Available for Sale Securities, amortized cost | 521,322,159 | 573,870,562
Available for Sale Securities, gross unrealized gains | 4,026,041 | 2,643,218
Available for Sale Securities, gross unrealized losses | (10,013,103) | (24,755,322)
Available for Sale Securities, fair value | 515,335,097 | 551,758,458
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, amortized cost | 165,737,372 | 144,401,895
Securities held to maturity, gross unrealized gains | 1,492,583 | 299,789
Securities held to maturity, gross unrealized losses | (2,609,628) | (7,111,579)
Securities held to maturity, fair value | 164,620,327 | 137,590,105
Securities available for sale: |  |
Available for Sale Securities, amortized cost | 32,871,334 | 35,813,866
Available for Sale Securities, gross unrealized gains | 1,156,141 | 923,315
Available for Sale Securities, gross unrealized losses | (170,004) | (778,324)
Available for Sale Securities, fair value | 33,857,471 | 35,958,857
Other Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, amortized cost | 1,050,000 | 1,050,000
Securities held to maturity, gross unrealized gains | 0 | 0
Securities held to maturity, gross unrealized losses | 0 | 0
Securities held to maturity, fair value | 1,050,000 | 1,050,000
Securities available for sale: |  |
Available for Sale Securities, amortized cost | 1,401,827 | 1,372,365
Available for Sale Securities, gross unrealized gains | 560,129 | 524,798
Available for Sale Securities, gross unrealized losses | 0 | 0
Available for Sale Securities, fair value | 1,961,956 | 1,897,163
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Available for Sale Securities, amortized cost | 334,083,927 | 376,574,132
Available for Sale Securities, gross unrealized gains | 109,470 | 41,696
Available for Sale Securities, gross unrealized losses | (8,572,941) | (20,142,841)
Available for Sale Securities, fair value | 325,620,456 | 356,472,987
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Available for Sale Securities, amortized cost | 152,965,071 | 160,110,199
Available for Sale Securities, gross unrealized gains | 2,200,301 | 1,153,409
Available for Sale Securities, gross unrealized losses | (1,270,158) | (3,834,157)
Available for Sale Securities, fair value | $ 153,895,214 | $ 157,429,451

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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=28360136&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=27724398&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=6871852&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=27724398&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=27724398&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=27724398&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=27724398&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=27724398&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=27724398&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=27724398&loc=d3e27232-111563 + Details
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