Note 3 - Investment Securities (Details) - Gross Unrealized Losses and Fair value of Securities in a Continuous Unrealized Loss Position (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Securities available for sale:
Available for Sale Securities less than 12 months fair value	$ 441,808,604	$ 85,986,271
Available for Sale Securities less than 12 months gross unrealized losses	(22,813,786)	(350,027)
Available for Sale Securities 12 months or more fair value	26,081,796	217,500
Available for Sale Securities 12 months or more gross unrealized losses	(1,941,536)	(23,469)
Available for Sale Securities fair value	467,890,400	86,203,771
Available for Sale Securities gross unrealized losses	(24,755,322)	(373,496)
US States and Political Subdivisions Debt Securities [Member]
Securities held to maturity:
Held to Maturity Securities less than 12 months fair value	101,983,602	4,282,352
Held to Maturity Securities less than 12 months gross unrealized losses	(6,711,240)	(71,648)
Held to Maturity Securities 12 months or more fair value	2,697,375
Held to Maturity Securities 12 months or more gross unrealized losses	(400,339)
Held to Maturity Securities fair value	104,680,977	4,282,352
Held to Maturity Securities gross unrealized losses	(7,111,579)	(71,648)
Securities available for sale:
Available for Sale Securities less than 12 months fair value	13,890,692	1,039,625
Available for Sale Securities less than 12 months gross unrealized losses	(724,939)	(18,834)
Available for Sale Securities 12 months or more fair value	985,687
Available for Sale Securities 12 months or more gross unrealized losses	(53,385)
Available for Sale Securities fair value	14,876,379	1,039,625
Available for Sale Securities gross unrealized losses	(778,324)	(18,834)
US Government Agencies Debt Securities [Member]
Securities available for sale:
Available for Sale Securities less than 12 months fair value	333,194,820	55,621,718
Available for Sale Securities less than 12 months gross unrealized losses	(19,141,077)	(160,279)
Available for Sale Securities 12 months or more fair value	10,978,390	0
Available for Sale Securities 12 months or more gross unrealized losses	(1,001,764)	0
Available for Sale Securities fair value	344,173,210	55,621,718
Available for Sale Securities gross unrealized losses	(20,142,841)	(160,279)
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Available for Sale Securities less than 12 months fair value	94,723,092	29,324,928
Available for Sale Securities less than 12 months gross unrealized losses	(2,947,770)	(170,914)
Available for Sale Securities 12 months or more fair value	14,117,719
Available for Sale Securities 12 months or more gross unrealized losses	(886,387)
Available for Sale Securities fair value	108,840,811	29,324,928
Available for Sale Securities gross unrealized losses	(3,834,157)	(170,914)
Other Securities [Member]
Securities available for sale:
Available for Sale Securities 12 months or more fair value		217,500
Available for Sale Securities 12 months or more gross unrealized losses		(23,469)
Available for Sale Securities fair value		217,500
Available for Sale Securities gross unrealized losses		$ (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

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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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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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