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Note 3 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | $ 128,656,909 | $ 180,624,957
Securities available for sale, less than 12 months, gross unrealized losses | (1,138,843) | (3,545,097)
Securities available for sale, 12 months or more, fair value | 71,569,641 | 13,274,726
Securities available for sale, 12 months or more, gross unrealized losses | (1,761,568) | (388,823)
Securities available for sale, fair value | 200,226,550 | 193,899,683
Securities available for sale, gross unrealized losses | (2,900,411) | (3,933,920)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | 23,750,826 | 122,271,533
Securities held to maturity, less than 12 months, gross unrealized losses | (354,460) | (4,076,647)
Securities held to maturity, 12 months or more, fair value | 72,611,780 | 13,010,803
Securities held to maturity, 12 months or more, gross unrealized losses | (2,133,659) | (618,087)
Securities held to maturity, fair value | 96,362,606 | 135,282,336
Securities held to maturity, gross unrealized losses | (2,488,119) | (4,694,734)
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 10,229,337 | 34,152,822
Securities available for sale, less than 12 months, gross unrealized losses | (41,151) | (618,462)
Securities available for sale, 12 months or more, fair value | 9,997,433 | 338,099
Securities available for sale, 12 months or more, gross unrealized losses | (169,949) | (19,454)
Securities available for sale, fair value | 20,226,770 | 34,490,921
Securities available for sale, gross unrealized losses | (211,100) | (637,916)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 28,576,258 | 21,788,139
Securities available for sale, less than 12 months, gross unrealized losses | (200,022) | (257,640)
Securities available for sale, 12 months or more, fair value | 3,640,477 | 5,499,012
Securities available for sale, 12 months or more, gross unrealized losses | (149,945) | (72,945)
Securities available for sale, fair value | 32,216,735 | 27,287,151
Securities available for sale, gross unrealized losses | (349,967) | (330,585)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 88,927,779 | 121,506,582
Securities available for sale, less than 12 months, gross unrealized losses | (871,855) | (2,641,664)
Securities available for sale, 12 months or more, fair value | 57,931,731 | 7,437,615
Securities available for sale, 12 months or more, gross unrealized losses | (1,441,674) | (296,424)
Securities available for sale, fair value | 146,859,510 | 128,944,197
Securities available for sale, gross unrealized losses | (2,313,529) | (2,938,088)
Other Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 923,535 | 3,177,414
Securities available for sale, less than 12 months, gross unrealized losses | (25,815) | (27,331)
Securities available for sale, 12 months or more, fair value |  |
Securities available for sale, fair value | 923,535 | 3,177,414
Securities available for sale, gross unrealized losses | $ (25,815) | $ (27,331)

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