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Note 3 - Investment Securities (Details) - Amortized Cost and Fair Value of Investment Securities - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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Securities held to maturity: |  |
Securities held to maturity, amortized cost | $ 253,674,159 | $ 199,879,574
Securities held to maturity, gross unrealized gains | 3,190,558 | 2,420,298
Securities held to maturity, gross unrealized losses | (1,173,432) | (1,186,076)
Securities held to maturity, fair value | 255,691,285 | 201,113,796
Securities available for sale: |  |
Securities available for sale, amortized cost | 325,597,000 | 454,166,979
Securities available for sale, gross unrealized gains | 2,029,523 | 3,360,874
Securities available for sale, gross unrealized losses | (4,191,541) | (5,868,223)
Securities available for sale, fair value | 323,434,982 | 451,659,630
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, amortized cost | 252,624,159 | 198,829,574
Securities held to maturity, gross unrealized gains | 3,190,558 | 2,420,298
Securities held to maturity, gross unrealized losses | (1,173,432) | (1,186,076)
Securities held to maturity, fair value | 254,641,285 | 200,063,796
Securities available for sale: |  |
Securities available for sale, amortized cost | 26,764,981 | 29,408,740
Securities available for sale, gross unrealized gains | 872,985 | 1,053,713
Securities available for sale, gross unrealized losses | (59,378) | (62,472)
Securities available for sale, fair value | 27,578,588 | 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 | 1,108,124 | 1,342,554
Securities available for sale, gross unrealized gains | 540,919 | 625,145
Securities available for sale, gross unrealized losses | (163) | (846)
Securities available for sale, fair value | 1,648,880 | 1,966,853
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 216,281,416 | 312,959,760
Securities available for sale, gross unrealized gains | 104,524 | 173,685
Securities available for sale, gross unrealized losses | (2,848,561) | (5,263,873)
Securities available for sale, fair value | 213,537,379 | 307,869,572
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 81,442,479 | 110,455,925
Securities available for sale, gross unrealized gains | 511,095 | 1,508,331
Securities available for sale, gross unrealized losses | (1,283,439) | (541,032)
Securities available for sale, fair value | $ 80,670,135 | $ 111,423,224

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