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Note 20 - Fair Value of Financial Instruments and Fair Value Measurements - Quantitative Information About Recurring Level 3 Fair Value Measurement (Details) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Fair Value |  | $ 353,066,166 | $ 354,246,904
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | 353,066,166 | 354,246,904
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | 4,277,568 | 7,297,497
US States and Political Subdivisions Debt Securities [Member] |  |  |
Fair Value |  | 3,989,109 | 4,492,826
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | 3,989,109 | 4,492,826
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | $ 214,475 | $ 215,366
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate [Member] |  |  |
Range Weighted Average | [1] |  |
US Government Agencies Debt Securities [Member] |  |  |
Fair Value |  | $ 346,205,172 | $ 346,723,419
US Government Agencies Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | 346,205,172 | 346,723,419
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | $ 4,063,093 | $ 5,022,131
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate [Member] |  |  |
Range Weighted Average | [1] |  |
Corporate Debt Securities [Member] |  |  |
Fair Value |  | $ 2,871,885 | $ 2,060,000
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  | 2,871,885 | 2,060,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value |  |  | $ 2,060,000
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate [Member] |  |  |
Range Weighted Average | [1] |  |
[1] | The Company relies on a third-party pricing service to value its securities. The details of the unobservable inputs and other adjustments used by the third-party pricing service were not readily available to the Company.

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