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Note 2 - Investment Securities (Details) - Gross Unrealized Losses and Fair Value of Securities in a Continuous Unrealized Loss Position (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Securities available for sale: |  |
Available for Sale Securities less than 12 months fair value | $ 417,394,320 | $ 441,808,604
Available for Sale Securities less than 12 months gross unrealized losses | (14,769,120) | (22,813,786)
Available for Sale Securities 12 months or more fair value | 34,224,213 | 26,081,796
Available for Sale Securities 12 months or more gross unrealized losses | (1,845,235) | (1,941,536)
Available for Sale Securities fair value | 451,618,533 | 467,890,400
Available for Sale Securities gross unrealized losses | (16,614,355) | (24,755,322)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Held to Maturity Securities less than 12 months fair value | 90,268,363 | 101,983,602
Held to Maturity Securities less than 12 months gross unrealized losses | (3,972,217) | (6,711,240)
Held to Maturity Securities 12 months or more fair value | 11,141,166 | 2,697,375
Held to Maturity Securities 12 months or more gross unrealized losses | (795,903) | (400,339)
Held to Maturity Securities fair value | 101,409,529 | 104,680,977
Held to Maturity Securities gross unrealized losses | (4,768,120) | (7,111,579)
Securities available for sale: |  |
Available for Sale Securities less than 12 months fair value | 12,715,294 | 13,890,692
Available for Sale Securities less than 12 months gross unrealized losses | (372,659) | (724,939)
Available for Sale Securities 12 months or more fair value | 1,699,797 | 985,687
Available for Sale Securities 12 months or more gross unrealized losses | (44,367) | (53,385)
Available for Sale Securities fair value | 14,415,091 | 14,876,379
Available for Sale Securities gross unrealized losses | (417,026) | (778,324)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Available for Sale Securities less than 12 months fair value | 330,406,007 | 333,194,820
Available for Sale Securities less than 12 months gross unrealized losses | (12,809,546) | (19,141,077)
Available for Sale Securities 12 months or more fair value | 11,194,076 | 10,978,390
Available for Sale Securities 12 months or more gross unrealized losses | (786,261) | (1,001,764)
Available for Sale Securities fair value | 341,600,083 | 344,173,210
Available for Sale Securities gross unrealized losses | (13,595,807) | (20,142,841)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Available for Sale Securities less than 12 months fair value | 74,273,019 | 94,723,092
Available for Sale Securities less than 12 months gross unrealized losses | (1,586,915) | (2,947,770)
Available for Sale Securities 12 months or more fair value | 21,330,340 | 14,117,719
Available for Sale Securities 12 months or more gross unrealized losses | (1,014,607) | (886,387)
Available for Sale Securities fair value | 95,603,359 | 108,840,811
Available for Sale Securities gross unrealized losses | $ (2,601,522) | $ (3,834,157)

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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