Note 6 - Fair Value (Detail) - Assets Measured at Fair Value on a Recurring Basis (USD $)	Jun. 30, 2012	Dec. 31, 2011
Securities available for sale:
Securities available for sale	$ 638,137,836	$ 565,029,291
US Government Agencies Debt Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Securities available for sale:
Securities available for sale	389,599,752	428,955,220
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	0	0
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	389,599,752	428,955,220
US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Residential Mortgage Backed Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Securities available for sale:
Securities available for sale	165,827,201	108,853,749
Residential Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	0	0
Residential Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	165,827,201	108,853,749
Residential Mortgage Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
US States and Political Subdivisions Debt Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Securities available for sale:
Securities available for sale	81,071,908	25,689,364
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	0	0
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	81,071,908	25,689,364
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Trust preferred securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Securities available for sale:
Securities available for sale	102,000	80,800
Trust preferred securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	0	0
Trust preferred securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	102,000	80,800
Trust preferred securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Equity Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Securities available for sale:
Securities available for sale	1,536,975	1,450,158
Equity Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	215,189	191,506
Equity Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	1,321,786	1,258,652
Equity Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Estimate of Fair Value, Fair Value Disclosure [Member]
Securities available for sale:
Securities available for sale	638,137,836	565,029,291
Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	215,189	191,506
Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	637,922,647	564,837,785
Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	$ 0	$ 0

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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