Note 3 - Investment Securities (Details) - Gross Unrealized Losses and Fair value of Securities in a Continuous Unrealized Loss Position (USD $)	6 Months Ended	12 Months Ended
Jun. 30, 2013	Dec. 31, 2012
Securities available for sale:
Available for Sale Securities less than 12 months fair value	$ 468,449,328	$ 85,986,271
Available for Sale Securities less than 12 months gross unrealized losses	(18,643,284)	(350,027)
Available for Sale Securities 12 months or more fair value	2,306,454	217,500
Available for Sale Securities 12 months or more gross unrealized losses	(30,434)	(23,469)
Available for Sale Securities fair value	470,755,782	86,203,771
Available for Sale Securities gross unrealized losses	(18,673,718)	(373,496)
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
Held to Maturity Securities less than 12 months fair value	88,263,477	4,282,352
Held to Maturity Securities less than 12 months gross unrealized losses	(5,853,172)	(71,648)
Held to Maturity Securities 12 months or more fair value	0	0
Held to Maturity Securities 12 months or more gross unrealized losses	0	0
Held to Maturity Securities fair value	88,263,477	4,282,352
Held to Maturity Securities gross unrealized losses	(5,853,172)	(71,648)
Securities available for sale:
Available for Sale Securities less than 12 months fair value	14,212,014	1,039,625
Available for Sale Securities less than 12 months gross unrealized losses	(752,811)	(18,834)
Available for Sale Securities 12 months or more fair value	0	0
Available for Sale Securities 12 months or more gross unrealized losses	0	0
Available for Sale Securities fair value	14,212,014	1,039,625
Available for Sale Securities gross unrealized losses	(752,811)	(18,834)
US Government Agencies Debt Securities [Member]
Securities available for sale:
Available for Sale Securities less than 12 months fair value	351,380,421	55,621,718
Available for Sale Securities less than 12 months gross unrealized losses	(14,836,396)	(160,279)
Available for Sale Securities 12 months or more fair value	0	0
Available for Sale Securities 12 months or more gross unrealized losses	0	0
Available for Sale Securities fair value	351,380,421	55,621,718
Available for Sale Securities gross unrealized losses	(14,836,396)	(160,279)
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Available for Sale Securities less than 12 months fair value	102,856,893	29,324,928
Available for Sale Securities less than 12 months gross unrealized losses	(3,054,077)	(170,914)
Available for Sale Securities 12 months or more fair value	2,065,109	0
Available for Sale Securities 12 months or more gross unrealized losses	(30,216)	0
Available for Sale Securities fair value	104,922,002	29,324,928
Available for Sale Securities gross unrealized losses	(3,084,293)	(170,914)
Equity Securities, Other [Member]
Securities available for sale:
Available for Sale Securities less than 12 months fair value	0
Available for Sale Securities less than 12 months gross unrealized losses	0
Available for Sale Securities 12 months or more fair value	241,345	217,500
Available for Sale Securities 12 months or more gross unrealized losses	(218)	(23,469)
Available for Sale Securities fair value	241,345	217,500
Available for Sale Securities gross unrealized losses	$ (218)	$ (23,469)

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Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(2)

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Amount of unrealized loss on securities classified as available-for-sale.

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months.

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-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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-Publisher FASB

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Amount of unrealized loss on investments in held-to-maturity securities that have been in a loss position for twelve months or longer.

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Amount of unrealized loss before deducting unrealized gain on investments in held-to-maturity securities that have been in a loss position for less than twelve months.

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