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Note 20 - Fair Value of Financial Instruments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Recurring Securities Available for Sale | $ 353,066,166 | $ 354,246,904
Fair Value, Measurements, Recurring [Member] |  |
Recurring Securities Available for Sale | 353,066,166 | 354,246,904
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 348,788,598 | 346,949,407
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 4,277,568 | 7,297,497
Fair Value, Measurements, Nonrecurring [Member] |  |
Impaired Loans | 3,351,735 | 4,875,918
Other Real Estate | 1,182,783 | 2,014,904
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Impaired Loans |  |
Other Real Estate |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Impaired Loans |  |
Other Real Estate |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired Loans | 3,351,735 | 4,875,918
Other Real Estate | 1,182,783 | 2,014,904
US Government Agencies Debt Securities [Member] |  |
Recurring Securities Available for Sale | 346,205,172 | 346,723,419
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Recurring Securities Available for Sale | 346,205,172 | 346,723,419
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 342,142,079 | 341,701,288
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 4,063,093 | 5,022,131
US States and Political Subdivisions Debt Securities [Member] |  |
Recurring Securities Available for Sale | 3,989,109 | 4,492,826
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Recurring Securities Available for Sale | 3,989,109 | 4,492,826
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 3,774,634 | 4,277,460
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale | 214,475 | 215,366
Corporate Debt Securities [Member] |  |
Recurring Securities Available for Sale | 2,871,885 | 2,060,000
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Recurring Securities Available for Sale | 2,871,885 | 2,060,000
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale | 2,871,885 |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale |  | 2,060,000
Asset-backed Securities [Member] |  |
Recurring Securities Available for Sale |  | 970,659
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Recurring Securities Available for Sale |  | 970,659
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Recurring Securities Available for Sale |  |
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Recurring Securities Available for Sale |  | 970,659
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Recurring Securities Available for Sale |  |

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