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Note 3 - Investment Securities (Details Textual) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Number of Securities |  | 613 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 223 |  |
Aggregate Depreciation from Amortized Cost Basis, Percent |  | 0.80% |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year |  | 110 |  |
Other than Temporary Impairment Losses, Investments |  | $ 0 | $ 0 | $ 0
Gain on Sale of Investments | $ 4,010,877 | 67,351 | 4,845,009 | $ 1,045,444
Security Owned and Pledged as Collateral, Fair Value |  | $ 78,642,843 | $ 118,811,905 |
General Obligation Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage |  | 0.00% | 0.00% |
Revenue Bonds [Member] | Stockholders' Equity, Total [Member] | Credit Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage |  | 0.00% | 0.00% |
Municipal Bonds [Member] | General Obligation Bonds [Member] |  |  |  |
Number of Issuers |  | 131 | 116 |
Other Investments |  | $ 108,000,000 | $ 116,500,000 |
Number of States Investments Held in |  | 26 | 21 |
Municipal Bonds [Member] | General Obligation Bonds [Member] | Minimum [Member] |  |  |  |
Other Investments |  | $ 5,000,000 | $ 5,000,000 |
Municipal Bonds [Member] | General Obligation Bonds [Member] | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |  |
Number of States Investments Held in |  | 6 | 5 |
Municipal Bonds [Member] | Revenue Bonds [Member] |  |  |  |
Number of Issuers |  | 145 | 120 |
Other Investments |  | $ 337,300,000 | $ 255,500,000 |
Number of States Investments Held in |  | 16 | 12 |
Municipal Bonds [Member] | Revenue Bonds [Member] | Minimum [Member] |  |  |  |
Other Investments |  | $ 5,000,000 | $ 5,000,000 |
Municipal Bonds [Member] | Revenue Bonds [Member] | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |  |
Number of States Investments Held in |  | 7 | 6 |
Equity Securities [Member] |  |  |  |
Percentage of Investment Portfolio |  | 1.00% | 1.00% |

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