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Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities - USD ($) | Jun. 30, 2015 | Dec. 31, 2014
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Securities held to maturity: |  |
Securities held to maturity, amortized cost | $ 225,138,234 | $ 199,879,574
Securities held to maturity, gross unrealized gains | 1,576,216 | 2,420,298
Securities held to maturity, gross unrealized losses | (3,173,269) | (1,186,076)
Securities held to maturity, fair value | 223,541,181 | 201,113,796
Securities available for sale: |  |
Securities available for sale, amortized cost | 369,710,718 | 454,166,979
Securities available for sale, gross unrealized gains | 2,626,551 | 3,360,874
Securities available for sale, gross unrealized losses | (5,107,486) | (5,868,223)
Securities available for sale, fair value | 367,229,783 | 451,659,630
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, amortized cost | 224,088,234 | 198,829,574
Securities held to maturity, gross unrealized gains | 1,576,216 | 2,420,298
Securities held to maturity, gross unrealized losses | (3,173,269) | (1,186,076)
Securities held to maturity, fair value | 222,491,181 | 200,063,796
Securities available for sale: |  |
Securities available for sale, amortized cost | 27,150,148 | 29,408,740
Securities available for sale, gross unrealized gains | 855,670 | 1,053,713
Securities available for sale, gross unrealized losses | (102,115) | (62,472)
Securities available for sale, fair value | 27,903,703 | 30,399,981
Other Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, amortized cost | 1,050,000 | 1,050,000
Securities held to maturity, fair value | 1,050,000 | 1,050,000
Securities available for sale: |  |
Securities available for sale, amortized cost | 1,389,291 | 1,342,554
Securities available for sale, gross unrealized gains | 654,319 | 625,145
Securities available for sale, gross unrealized losses | (5,013) | (846)
Securities available for sale, fair value | 2,038,597 | 1,966,853
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 260,141,312 | 312,959,760
Securities available for sale, gross unrealized gains | 222,875 | 173,685
Securities available for sale, gross unrealized losses | (3,920,526) | (5,263,873)
Securities available for sale, fair value | 256,443,661 | 307,869,572
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 81,029,967 | 110,455,925
Securities available for sale, gross unrealized gains | 893,687 | 1,508,331
Securities available for sale, gross unrealized losses | (1,079,832) | (541,032)
Securities available for sale, fair value | $ 80,843,822 | $ 111,423,224

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