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Note 2 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | $ 141,292,266 |
Securities held to maturity, less than 12 months, gross unrealized losses | (3,888,393) |
Securities held to maturity, 12 months or more, fair value | 61,121,755 |
Securities held to maturity, 12 months or more, gross unrealized losses | (3,827,871) |
Securities held to maturity, fair value | 202,414,021 |
Securities held to maturity, gross unrealized losses | (7,716,264) |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 165,068,419 | $ 128,656,909
Securities available for sale, less than 12 months, gross unrealized losses | (4,996,353) | (1,138,843)
Securities available for sale, 12 months or more, fair value | 70,964,048 | 71,569,641
Securities available for sale, 12 months or more, gross unrealized losses | (3,312,235) | (1,761,568)
Securities available for sale, fair value | 236,032,467 | 200,226,550
Securities available for sale, gross unrealized losses | (8,308,588) | (2,900,411)
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | 140,257,617 | 23,750,826
Securities held to maturity, less than 12 months, gross unrealized losses | (3,873,043) | (354,460)
Securities held to maturity, 12 months or more, fair value | 61,121,755 | 72,611,780
Securities held to maturity, 12 months or more, gross unrealized losses | (3,827,871) | (2,133,659)
Securities held to maturity, fair value | 201,379,372 | 96,362,606
Securities held to maturity, gross unrealized losses | (7,700,914) | (2,488,119)
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 36,033,296 | 10,229,337
Securities available for sale, less than 12 months, gross unrealized losses | (648,203) | (41,151)
Securities available for sale, 12 months or more, fair value | 7,706,943 | 9,997,433
Securities available for sale, 12 months or more, gross unrealized losses | (225,890) | (169,949)
Securities available for sale, fair value | 43,740,239 | 20,226,770
Securities available for sale, gross unrealized losses | (874,093) | (211,100)
US Government Agencies Debt Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 31,724,483 | 28,576,258
Securities available for sale, less than 12 months, gross unrealized losses | (928,027) | (200,022)
Securities available for sale, 12 months or more, fair value | 3,532,286 | 3,640,477
Securities available for sale, 12 months or more, gross unrealized losses | (181,197) | (149,945)
Securities available for sale, fair value | 35,256,769 | 32,216,735
Securities available for sale, gross unrealized losses | (1,109,224) | (349,967)
Residential Mortgage Backed Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 93,074,220 | 88,927,779
Securities available for sale, less than 12 months, gross unrealized losses | (3,402,034) | (871,855)
Securities available for sale, 12 months or more, fair value | 59,724,819 | 57,931,731
Securities available for sale, 12 months or more, gross unrealized losses | (2,905,148) | (1,441,674)
Securities available for sale, fair value | 152,799,039 | 146,859,510
Securities available for sale, gross unrealized losses | (6,307,182) | (2,313,529)
Other Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, less than 12 months, fair value | 1,034,649 |
Securities held to maturity, less than 12 months, gross unrealized losses | (15,350) |
Securities held to maturity, fair value | 1,034,649 |
Securities held to maturity, gross unrealized losses | (15,350) |
Securities available for sale: |  |
Securities available for sale, less than 12 months, fair value | 4,236,420 | 923,535
Securities available for sale, less than 12 months, gross unrealized losses | (18,089) | (25,815)
Securities available for sale, fair value | 4,236,420 | 923,535
Securities available for sale, gross unrealized losses | $ (18,089) | $ (25,815)

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