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Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Securities by Contractual Maturity (USD $) | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Securities held to maturity: |  |
Due in one year or less | $ 12,682,406 |
Due in one year or less | 12,683,453 |
Due after one year through five years | 16,825,667 |
Due after one year through five years | 16,856,667 |
Due after five years | 156,332,066 |
Due after five years | 156,395,931 |
| 185,840,139 |
| 185,936,051 | 138,640,105
Securities available for sale: |  |
Due in one year or less | 3,649,998 |
Due in one year or less | 3,664,418 |
Due after one year through five years | 60,972,541 |
Due after one year through five years | 60,242,076 |
Due after five years | 280,607,350 |
Due after five years | 273,358,257 |
| 345,229,889 |
| 337,264,751 |
Amortized Cost | 474,406,289 |
Fair Value | 466,944,567 |
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Amortized Cost | 127,822,284 |
Fair Value | 127,779,749 |
Other Securities [Member] |  |
Securities held to maturity: |  |
| 1,050,000 | 1,050,000
Securities available for sale: |  |
Amortized Cost | 1,354,116 |
Fair Value | 1,900,067 |
US States and Political Subdivisions Debt Securities [Member] | Callable Securities [Member] |  |
Securities available for sale: |  |
Amortized Cost | 18,473,306 |
Fair Value | 18,985,950 |
Securities held to maturity: |  |
Municipal securities | 99,883,698 |
Municipal securities | 100,074,857 |
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
| 184,886,051 | 137,590,105
US Government-sponsored Enterprises Debt Securities [Member] | Callable Securities [Member] |  |
Securities available for sale: |  |
Amortized Cost | 250,617,040 |
Fair Value | 243,092,527 |
Callable Securities [Member] |  |
Securities available for sale: |  |
Amortized Cost | 269,090,346 |
Fair Value | $ 262,078,477 |

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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