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Note 19 - Fair Value of Financial Instruments and Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Impaired Loans [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | $ 8,544,993 | $ 7,778,279
Other Real Estate [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | 2,535,884 | 6,128,365
Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | 296,149,299 | 274,594,586
US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | 291,049,853 | 271,063,669
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | 5,099,446 | 3,530,917
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Other Real Estate [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | 0 | 0
Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | 0 | 0
Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Other Real Estate [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | 295,218,988 | 273,646,196
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | 291,049,853 | 271,063,669
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | 4,169,135 | 2,582,527
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | 8,544,993 | 7,778,279
Fair Value, Inputs, Level 3 [Member] | Other Real Estate [Member] |  |
Nonrecurring |  |
Assets, fair value, nonrecurring | 2,535,884 | 6,128,365
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | 930,311 | 948,390
Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | 0 | 0
Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |
U.S. Government Agencies |  |
Assets, fair value, recurring | $ 930,311 | $ 948,390

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