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Note 2 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities - USD ($) | Mar. 31, 2016 | Dec. 31, 2015
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Securities held to maturity: |  |
Securities held to maturity, amortized cost | $ 261,129,586 | $ 253,674,159
Securities held to maturity, gross unrealized gains | 4,143,965 | 3,190,558
Securities held to maturity, gross unrealized losses | (858,829) | (1,173,432)
Securities held to maturity, fair value | 264,414,722 | 255,691,285
Securities available for sale: |  |
Securities available for sale, amortized cost | 273,844,647 | 325,597,000
Securities available for sale, gross unrealized gains | 2,814,866 | 2,029,523
Securities available for sale, gross unrealized losses | (471,646) | (4,191,541)
Securities available for sale, fair value | 276,187,867 | 323,434,982
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, amortized cost | 260,079,586 | 252,624,159
Securities held to maturity, gross unrealized gains | 4,143,965 | 3,190,558
Securities held to maturity, gross unrealized losses | (858,829) | (1,173,432)
Securities held to maturity, fair value | 263,364,722 | 254,641,285
Securities available for sale: |  |
Securities available for sale, amortized cost | 24,113,773 | 26,764,981
Securities available for sale, gross unrealized gains | 839,125 | 872,985
Securities available for sale, gross unrealized losses | (23,243) | (59,378)
Securities available for sale, fair value | 24,929,655 | 27,578,588
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 | 1,637,366 | 1,108,124
Securities available for sale, gross unrealized gains | 428,027 | 540,919
Securities available for sale, gross unrealized losses | (1,377) | (163)
Securities available for sale, fair value | 2,064,016 | 1,648,880
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 132,080,737 | 216,281,416
Securities available for sale, gross unrealized gains | 786,623 | 104,524
Securities available for sale, gross unrealized losses | (125,538) | (2,848,561)
Securities available for sale, fair value | 132,741,822 | 213,537,379
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 116,012,771 | 81,442,479
Securities available for sale, gross unrealized gains | 761,091 | 511,095
Securities available for sale, gross unrealized losses | (321,488) | (1,283,439)
Securities available for sale, fair value | $ 116,452,374 | $ 80,670,135

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