Note 2 - Investment Securities (Details Textual)	3 Months Ended	12 Months Ended
Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Number of Securities	554
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	255
Aggregate Depreciation from Amortized Cost Basis, Percent	1.50%
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	24
Proceeds from Sale and Maturity of Marketable Securities	$ 0	$ 55,526,851
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	112		116
Other Investments	$ 99,300,000		$ 116,500,000
Number of States Investments Held in	21		21
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] \| General Obligation Bonds [Member] \| Minimum [Member]
Other Investments	$ 5,000,000		$ 5,000,000
Number of States Investments Held in	5,000,000
Municipal Bonds [Member] \| Revenue Bonds [Member]
Number of Issuers	123		120
Other Investments	$ 255,000,000		$ 255,500,000
Number of States Investments Held in	12		12
Municipal Bonds [Member] \| Revenue Bonds [Member] \| Aggregate Fair Value Exceeding 5 Million [Member]
Number of States Investments Held in			6
Municipal Bonds [Member] \| Revenue Bonds [Member] \| Minimum [Member]
Other Investments	$ 5,000,000		$ 5,000,000
Equity Securities [Member]
Percentage of Investment Portfolio	1.00%	1.00%
Other than Temporary Impairment Losses, Investments	$ 0	$ 0
Debt Securities [Member]
Other than Temporary Impairment Losses, Investments	$ 0	$ 0

The aggregate depreciation from amortized cost basis as a percent.

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Number of issuers of debt securities.

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Number of securities.

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Represents the number of states investments are held in.

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The percentage of the companies investment portfolio by type of investment.

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Amount of investments classified as other.

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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