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Note 2 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position - USD ($) | Jun. 30, 2015 | Dec. 31, 2014
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Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | $ 174,668,810 | $ 35,844,695
Securities available for sale, less than 12 months, gross unrealized losses | (2,389,486) | (115,453)
Securities available for sale, 12 months or more, fair value | 110,544,633 | 297,739,167
Securities available for sale, 12 months or more, gross unrealized losses | (2,718,000) | (5,752,770)
Securities available for sale, fair value | 285,213,443 | 333,583,862
Securities available for sale, gross unrealized losses | (5,107,486) | (5,868,223)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | 76,375,019 | 20,419,052
Securities held to maturity, less than 12 months, gross unrealized losses | (2,218,961) | (587,992)
Securities held to maturity, 12 months or more, fair value | 34,698,604 | 38,779,545
Securities held to maturity, 12 months or more, gross unrealized losses | (954,308) | (598,084)
Securities held to maturity, fair value | 111,073,623 | 59,198,597
Securities held to maturity, gross unrealized losses | (3,173,269) | (1,186,076)
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 4,417,658 | 920,935
Securities available for sale, less than 12 months, gross unrealized losses | (49,532) | (1,773)
Securities available for sale, 12 months or more, fair value | 1,322,180 | 4,425,337
Securities available for sale, 12 months or more, gross unrealized losses | (52,583) | (60,699)
Securities available for sale, fair value | 5,739,838 | 5,346,272
Securities available for sale, gross unrealized losses | (102,115) | (62,472)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 138,963,817 | 23,970,085
Securities available for sale, less than 12 months, gross unrealized losses | (1,920,958) | (102,695)
Securities available for sale, 12 months or more, fair value | 87,910,053 | 255,743,056
Securities available for sale, 12 months or more, gross unrealized losses | (1,999,568) | (5,161,178)
Securities available for sale, fair value | 226,873,870 | 279,713,141
Securities available for sale, gross unrealized losses | (3,920,526) | (5,263,873)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 31,047,920 | 10,710,671
Securities available for sale, less than 12 months, gross unrealized losses | (413,983) | (10,139)
Securities available for sale, 12 months or more, fair value | 21,312,400 | 37,570,774
Securities available for sale, 12 months or more, gross unrealized losses | (665,849) | (530,893)
Securities available for sale, fair value | 52,360,320 | 48,281,445
Securities available for sale, gross unrealized losses | (1,079,832) | (541,032)
Other Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 239,415 | 243,004
Securities available for sale, less than 12 months, gross unrealized losses | (5,013) | (846)
Securities available for sale, fair value | 239,415 | 243,004
Securities available for sale, gross unrealized losses | $ (5,013) | $ (846)

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