Note 6 - Fair Value (Detail) - Assets Measured at Fair Value on a Recurring Basis (USD $)	Mar. 31, 2013	Dec. 31, 2012
Securities available for sale:
Securities available for sale	$ 605,545,374	$ 530,159,986
US Government Agencies Debt Securities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Securities available for sale:
Securities available for sale	403,839,932	338,609,371
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	403,839,932	338,609,371
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	174,802,232	163,601,103
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	174,802,232	163,601,103
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	24,991,041	26,185,736
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	24,991,041	26,185,736
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	185,320	139,400
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	185,320	139,400
Trust preferred securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Equity Securities, Other [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Securities available for sale:
Securities available for sale	1,726,849	1,624,376
Equity Securities, Other [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	255,370	234,453
Equity Securities, Other [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	1,471,479	1,389,923
Equity Securities, Other [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Impaired Loans/Leases [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Securities available for sale:
Assets measured on a non-recurring basis	12,569,814	18,054,234
Impaired Loans/Leases [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	0	0
Impaired Loans/Leases [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	0	0
Impaired Loans/Leases [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	12,569,814	18,054,234
Other Real Estate Owned [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Securities available for sale:
Assets measured on a non-recurring basis	3,973,773	4,270,901
Other Real Estate Owned [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	0	0
Other Real Estate Owned [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	0	0
Other Real Estate Owned [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	3,973,773	4,270,901
Estimate of Fair Value, Fair Value Disclosure [Member]
Securities available for sale:
Securities available for sale	605,545,374	530,159,986
Assets measured on a non-recurring basis	16,543,587	22,325,135
Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	255,370	234,453
Assets measured on a non-recurring basis	0	0
Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	605,290,004	529,925,533
Assets measured on a non-recurring basis	0	0
Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Securities available for sale	0	0
Assets measured on a non-recurring basis	$ 16,543,587	$ 22,325,135

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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