Note 6 - Fair Value (Details) - Assets Measured at Fair Value on a Recurring Basis (USD $)	Jun. 30, 2014	Dec. 31, 2013
Securities available for sale:
Securities available for sale	$ 515,335,097	$ 551,758,458
Assets measured on a non-recurring basis	20,109,036	19,516,934
Derivative instruments	1,820,501
	517,155,598
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	325,620,456	356,472,987
US Government Agencies Debt Securities [Member]
Securities available for sale:
Securities available for sale	325,620,456	356,472,987
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	153,895,214	157,429,451
Residential Mortgage Backed Securities [Member]
Securities available for sale:
Securities available for sale	153,895,214	157,429,451
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	33,857,471	35,958,857
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale:
Securities available for sale	33,857,471	35,958,857
Equity Securities, Other [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale	318,370	317,698
Equity Securities, Other [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale	1,643,586	1,579,465
Equity Securities, Other [Member]
Securities available for sale:
Securities available for sale	1,961,956	1,897,163
Fair Value, Inputs, Level 1 [Member]
Securities available for sale:
Securities available for sale		317,698
	318,370
Fair Value, Inputs, Level 2 [Member]
Securities available for sale:
Securities available for sale		551,440,760
Derivative instruments	1,820,501
	516,837,228
Fair Value, Inputs, Level 3 [Member] | Impaired Loans/Leases [Member]
Securities available for sale:
Assets measured on a non-recurring basis	8,281,725	9,009,557
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Securities available for sale:
Assets measured on a non-recurring basis	11,827,311	10,507,377
Fair Value, Inputs, Level 3 [Member]
Securities available for sale:
Assets measured on a non-recurring basis	20,109,036	19,516,934
Impaired Loans/Leases [Member]
Securities available for sale:
Assets measured on a non-recurring basis	8,281,725	9,009,557
Other Real Estate Owned [Member]
Securities available for sale:
Assets measured on a non-recurring basis	$ 11,827,311	$ 10,507,377