Note 19 - 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, 2016 |
Dec. 31, 2015 |
| Assets, fair value, recurring |
|
$ 930,311
|
| Impaired Loans [Member] |
|
|
| Assets, fair value, nonrecurring |
$ 6,952,343
|
8,544,993
|
| Other Real Estate [Member] |
|
|
| Assets, fair value, nonrecurring |
2,505,188
|
2,535,884
|
| Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] |
|
|
| Assets, fair value, nonrecurring |
|
|
| Fair Value, Inputs, Level 2 [Member] | Other Real Estate [Member] |
|
|
| Assets, fair value, nonrecurring |
|
|
| Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |
|
|
| Assets, fair value, nonrecurring |
6,952,343
|
8,544,993
|
| Fair Value, Inputs, Level 3 [Member] | Other Real Estate [Member] |
|
|
| Assets, fair value, nonrecurring |
2,505,188
|
2,535,884
|
| Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] |
|
|
| Assets, fair value, nonrecurring |
|
|
| Fair Value, Inputs, Level 1 [Member] | Other Real Estate [Member] |
|
|
| Assets, fair value, nonrecurring |
|
|
| Available-for-sale Securities [Member] |
|
|
| Assets, fair value, recurring |
323,657,870
|
296,149,299
|
| Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
| Assets, fair value, recurring |
323,081,486
|
295,218,988
|
| Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |
|
|
| Assets, fair value, recurring |
576,384
|
930,311
|
| Available-for-sale Securities [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Assets, fair value, recurring |
|
|
| US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] |
|
|
| Assets, fair value, recurring |
319,097,374
|
291,049,853
|
| US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
| Assets, fair value, recurring |
319,097,374
|
291,049,853
|
| US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |
|
|
| Assets, fair value, recurring |
|
|
| US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Assets, fair value, recurring |
|
|
| US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |
|
|
| Assets, fair value, recurring |
4,560,496
|
5,099,446
|
| US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
| Assets, fair value, recurring |
3,984,112
|
4,169,135
|
| US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |
|
|
| Assets, fair value, recurring |
$ 576,384
|
930,311
|
| US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Assets, fair value, recurring |
|
|