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Note 13 -Federal and State Income Taxes (Details) - Reconciliation of the Expected Federal Income Tax Expense - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of the Expected Federal Income Tax Expense [Abstract] |  |  |  |  |  |  |  |  |  |  |
Computed "expected" tax expense |  |  |  |  |  |  |  |  | $ 7,208,993 | $ 6,297,027 | $ 6,844,665
Computed "expected" tax expense |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
Effect of graduated tax rates |  |  |  |  |  |  |  |  | $ (76,973) | $ (79,529) | $ (123,868)
Effect of graduated tax rates |  |  |  |  |  |  |  |  | (0.40%) | (0.40%) | (0.60%)
Tax exempt income, net |  |  |  |  |  |  |  |  | $ (3,461,438) | $ (2,646,275) | $ (1,790,049)
Tax exempt income, net |  |  |  |  |  |  |  |  | (16.80%) | (14.70%) | (9.20%)
Bank-owned life insurance |  |  |  |  |  |  |  |  | $ (616,737) | $ (585,312) | $ (624,847)
Bank-owned life insurance |  |  |  |  |  |  |  |  | (3.00%) | (3.30%) | (3.20%)
State income taxes, net of federal benefit, current year |  |  |  |  |  |  |  |  | $ 767,557 | $ 497,068 | $ 758,695
State income taxes, net of federal benefit, current year |  |  |  |  |  |  |  |  | 3.70% | 2.80% | 3.90%
Change in unrecognized tax benefits |  |  |  |  |  |  |  |  | $ 223,668 | $ (55,728) | $ 63,941
Change in unrecognized tax benefits |  |  |  |  |  |  |  |  | 1.10% | (0.30%) | 0.30%
Acquisition costs |  |  |  |  |  |  |  |  |  |  | $ 248,952
Acquisition costs |  |  |  |  |  |  |  |  |  |  | 1.30%
Other |  |  |  |  |  |  |  |  | $ (375,828) | $ (388,281) | $ (759,547)
Other |  |  |  |  |  |  |  |  | (1.80%) | (2.10%) | (3.90%)
| $ 2,263,293 | $ 2,468,871 | $ (1,974,411) | $ 911,489 | $ 344,497 | $ 1,028,876 | $ 1,193,312 | $ 472,285 | $ 3,669,242 | $ 3,038,970 | $ 4,617,942
|  |  |  |  |  |  |  |  | 17.80% | 17.00% | 23.60%

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